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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Plant Sci.</journal-id>
<journal-title>Frontiers in Plant Science</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Plant Sci.</abbrev-journal-title>
<issn pub-type="epub">1664-462X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fpls.2024.1331443</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Plant Science</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Phyllosphere bacterial community dynamics in response to bacterial wildfire disease: succession and interaction patterns</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Peng</surname>
<given-names>Deyuan</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/supervision/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname>
<given-names>Zhenhua</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/funding-acquisition/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Tian</surname>
<given-names>Jinyan</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname>
<given-names>Wei</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Guo</surname>
<given-names>Shijie</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Dai</surname>
<given-names>Xi</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Yin</surname>
<given-names>Huaqun</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/302983"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Li</surname>
<given-names>Liangzhi</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">
<sup>*</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/2277834"/>
<role content-type="https://credit.niso.org/contributor-roles/conceptualization/"/>
<role content-type="https://credit.niso.org/contributor-roles/methodology/"/>
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</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>Zhangjiajie Tobacco Company of Hunan Province</institution>, <addr-line>Zhangjiajie</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>School of Minerals Processing and Bioengineering, Central South University</institution>, <addr-line>Changsha</addr-line>, <country>China</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Key Laboratory of Biometallurgy of Ministry of Education, Central South University</institution>, <addr-line>Changsha</addr-line>, <country>China</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>Edited by: Davide Giovanardi, University of Modena and Reggio Emilia, Italy</p>
</fn>
<fn fn-type="edited-by">
<p>Reviewed by: Xingang Zhou, Northeast Agricultural University, China</p>
<p>Asharani Patel, Indian Agricultural Research Institute (ICAR), India</p>
</fn>
<fn fn-type="corresp" id="fn001">
<p>*Correspondence: Liangzhi Li, <email xlink:href="mailto:205601006@csu.edu.cn">205601006@csu.edu.cn</email>
</p>
</fn>
</author-notes>
<pub-date pub-type="epub">
<day>12</day>
<month>03</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>15</volume>
<elocation-id>1331443</elocation-id>
<history>
<date date-type="received">
<day>01</day>
<month>11</month>
<year>2023</year>
</date>
<date date-type="accepted">
<day>08</day>
<month>02</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2024 Peng, Wang, Tian, Wang, Guo, Dai, Yin and Li</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Peng, Wang, Tian, Wang, Guo, Dai, Yin and Li</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<p>Plants interact with complex microbial communities in which microorganisms play different roles in plant development and health. While certain microorganisms may cause disease, others promote nutrient uptake and resistance to stresses through a variety of mechanisms. Developing plant protection measures requires a deeper comprehension of the factors that influence multitrophic interactions and the organization of phyllospheric communities. High-throughput sequencing was used in this work to investigate the effects of climate variables and bacterial wildfire disease on the bacterial community&#x2019;s composition and assembly in the phyllosphere of tobacco (<italic>Nicotiana tabacum</italic> L.). The samples from June (M1), July (M2), August (M3), and September (M4) formed statistically separate clusters. The assembly of the whole bacterial population was mostly influenced by stochastic processes. PICRUSt2 predictions revealed genes enriched in the M3, a period when the plant wildfire disease index reached climax, were associated with the development of the wildfire disease (secretion of virulence factor), the enhanced metabolic capacity and environmental adaption. The M3 and M4 microbial communities have more intricate molecular ecological networks (MENs), bursting with interconnections within a densely networked bacterial population. The relative abundances of plant-beneficial and antagonistic microbes Clostridiales, Bacillales, Lactobacillales, and Sphingobacteriales, showed significant decrease in severally diseased sample (M3) compared to the pre-diseased samples (M1/M2). Following the results of MENs, we further test if the correlating bacterial pairs within the MEN have the possibility to share functional genes and we have unraveled 139 entries of such horizontal gene transfer (HGT) events, highlighting the significance of HGT in shaping the adaptive traits of plant-associated bacteria across the MENs, particularly in relation to host colonization and pathogenicity.</p>
</abstract>
<kwd-group>
<kwd>HGT (Horizontal gene transfer)</kwd>
<kwd>phyllosphere</kwd>
<kwd>bacterial communities</kwd>
<kwd>wildfire disease</kwd>
<kwd>molecular ecological network</kwd>
</kwd-group>
<counts>
<fig-count count="10"/>
<table-count count="0"/>
<equation-count count="1"/>
<ref-count count="98"/>
<page-count count="18"/>
<word-count count="8497"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-in-acceptance</meta-name>
<meta-value>Plant Pathogen Interactions</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1" sec-type="intro">
<title>Introduction</title>
<p>Plants harbor diverse microbial species playing crucial roles in their growth, health, and productivity (<xref ref-type="bibr" rid="B5">Bai et&#xa0;al., 2015</xref>; <xref ref-type="bibr" rid="B93">Xin et&#xa0;al., 2016</xref>; <xref ref-type="bibr" rid="B6">Brader et&#xa0;al., 2017</xref>; <xref ref-type="bibr" rid="B2">Ahmed et&#xa0;al., 2022</xref>). These microorganisms form co-evolved communities that contribute to disease protection and act as a supplement of the plant&#x2019;s immune system. Apart from the root zone, recent researches have emphasized the influence of phyllosphere microbes on plant growth, including nitrogen fixation, plant pathogen control, and organic pollutant bioremediation (<xref ref-type="bibr" rid="B86">Vorholt, 2012</xref>; <xref ref-type="bibr" rid="B95">Xu et&#xa0;al., 2022</xref>).</p>
<p>The contact between a terrestrial plant&#x2019;s aboveground section and the surrounding air is called the phyllosphere. It is estimated that the surface of approximately 100 million square kilometers of leaves harbors over 10<sup>26</sup> bacteria globally, making the phyllosphere highly biodiverse habitats (<xref ref-type="bibr" rid="B27">Forero-Junco et&#xa0;al., 2022</xref>).</p>
<p>Traditionally, the phyllosphere has been considered an inhospitable habitat for microbial colonization due to prolonged exposure to solar/ultraviolet radiation, extreme diurnal temperature fluctuations, desiccation, humidity fluctuations, rain scouring, and limited nutrient availability (<xref ref-type="bibr" rid="B80">Truchado et&#xa0;al., 2017</xref>).</p>
<p>High-throughput sequencing methods have, however, recently made it possible to characterize the spatiotemporal organization of the phyllosphere microbiome in great detail. Numerous microorganisms with densities as high as 10<sup>6</sup>&#x2013;10<sup>7</sup> cells per square centimeter have been found to reside in the phyllosphere, according to these research (<xref ref-type="bibr" rid="B43">Kembel et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B9">Carvalho and Castillo, 2018</xref>; <xref ref-type="bibr" rid="B21">Ding et&#xa0;al., 2022</xref>). These microbes perform a variety of biological tasks, including as improving plant resistance to disease, biocontrolling phytopathogens, fixing nitrogen, breaking down toxic and hazardous materials, and producing plant hormones and volatile organic compounds (<xref ref-type="bibr" rid="B86">Vorholt, 2012</xref>; <xref ref-type="bibr" rid="B95">Xu et&#xa0;al., 2022</xref>). Furthermore, the phyllosphere&#x2019;s suitability for experiments and visual examination makes it an appropriate model system for testing basic ecological ideas (<xref ref-type="bibr" rid="B64">Redford and Fierer, 2009</xref>; <xref ref-type="bibr" rid="B66">Remus-Emsermann and Schlechter, 2018</xref>).</p>
<p>Microorganisms, including phytopathogens, are found in intricate microbial communities within natural ecosystems (<xref ref-type="bibr" rid="B6">Brader et&#xa0;al., 2017</xref>; <xref ref-type="bibr" rid="B34">Hu et&#xa0;al., 2020</xref>; <xref ref-type="bibr" rid="B2">Ahmed et&#xa0;al., 2022</xref>). They interact with each other and with their host organisms or larger entities. However, comprehensive comprehension of multilateral interactions, particularly interactions within microbial communities, is in its infancy.</p>
<p>Plant disease development often involves collaborative efforts from various pathogens, commensal microorganisms, and abiotic factors. They directly affect host defenses and disrupt microbiota structures (<xref ref-type="bibr" rid="B33">Hajishengallis and Lamont, 2016</xref>). Auxiliary pathogens and commensal microbes, also identified as bacterial companions, facilitate the establishment of these pathogens in the community by exploiting compromised defenses, thereby enhancing their survival chances. Comprehensive understanding of these interactions is necessary for predicting disease incidence and severity and finding novel solutions against them. For example, <xref ref-type="bibr" rid="B15">Dai et&#xa0;al. (2022)</xref> investigate the spatiotemporal changes in community tobacco leaves infected by brown spot disease. The results of the investigation showed that <italic>Pseudomonas, Sphingomonas</italic>, and <italic>Methylobacterium</italic> all became more abundant proportional to the age of tobacco leaves. Similarly, <xref ref-type="bibr" rid="B49">Liu et&#xa0;al. (2022)</xref> showed that inoculating <italic>Bacillus velezensis</italic> SYL-3 suppressed diseases like <italic>Alternaria alternata</italic> and tobacco mosaic virus (TMV) while increasing beneficial bacteria like <italic>Pseudomonas</italic> and <italic>Sphingomonas</italic>.</p>
<p>Horizontal gene transfer (HGT) is of significant importance in the evolution and succession of microbial communities, particularly in the transmission and acquisition of genes among different organisms (<xref ref-type="bibr" rid="B48">Li L. et&#xa0;al., 2022</xref>). Through HGT, emerging pathogens can acquire new DNA fragments from other organisms, influencing their progression. This process is significant as it enables the rapid sharing of genes providing superior defense mechanisms among distantly related organisms, potentially facilitating processes like eco-invasion and adaptation to new environments. HGT occurs when a donor and recipient colonize a similar niche, promoting the colonization of novel microbial species in that niche. Consequently, HGT can lead to the emergence of microorganisms with altered pathogenicity and the development of entirely new pathogens (<xref ref-type="bibr" rid="B38">James et&#xa0;al., 2006</xref>; <xref ref-type="bibr" rid="B67">Richards et&#xa0;al., 2011</xref>; <xref ref-type="bibr" rid="B10">Chaib De Mares et&#xa0;al., 2015</xref>). Certain plant surface sites have been shown to be conducive to microbial growth and colonization, leading to localized increases in active cell densities. The aboveground plant compartments offer nutrient-rich environments that are particularly beneficial for HGT and have been characterized as &#x201c;hot spots&#x201d; for microbial HGT (<xref ref-type="bibr" rid="B61">Pinto-Carb&#xf3; et&#xa0;al., 2016</xref>). HGT can also be augmented by different compound excreted from plants (<xref ref-type="bibr" rid="B59">Nielsen and van Elsas, 2001</xref>; <xref ref-type="bibr" rid="B42">Kay et&#xa0;al., 2002</xref>). The implications of HGT extend beyond individual organisms, shaping the dynamics and genetic makeup of microbial communities.</p>
<p>In this study, a field cultivating the model plant, cigar tobacco (<italic>Nicotiana tabacum</italic> L.) affected by wildfire disease caused by the commonly-seen phytopathogen <italic>Pseudomonas syringae</italic> (<xref ref-type="bibr" rid="B92">Xin et&#xa0;al., 2018</xref>) was used for investigation on the natural succession of phyllosphere bacterial communities. The objectives of this study were to (i) clarify taxonomic and functional changes in the phyllosphere bacterial communities under biotic (bacterial wildfire disease) and environmental stresses of four time periods, M1, M2, M3, and M4, which correspond to the months of June, July, August, and September in 2022; (ii) explore ecological networks of various time periods and deduce putative gene sharing events within communities to offer insights into the microbial interaction.</p>
</sec>
<sec id="s2" sec-type="results">
<title>Results</title>
<sec id="s2_1">
<title>Dissecting bacterial community in the cigar tobacco phyllosphere</title>
<p>The forty-eight phyllosphere bacterial DNA samples yielded 3,599 operational taxonomic units (OTU) and 2,347,083 high-quality paired 16S rRNA gene sequences (average: 48,896; range: 46,698&#x2013;59,926 reads per sample). A respectable amount of reads for bacterial communities were acquired in all samples, according to rarefaction curves created to assess the richness of bacterial communities (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Figure S1</bold>
</xref>). The microbiome from the four time series groups formed statistically separate clusters, according to principal coordinate analysis (PCoA) of Bray&#x2013;Curtis distance. This suggests that the phyllospheric microbiome from different time periods displayed varied community compositions (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1A</bold>
</xref>). 51.9% of the total variation was explained by the first two axes combined (ANOISM, R = 0.601, P = 0.001). The four groups share 275 OTUs (the core taxa) in total; the M3 group contains the most unique OTUs (974), followed by the M4 group (478) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1B</bold>
</xref>). Richness, Shannon, Simpson, Pielou, and invsimpson are examples of alpha diversity indices that clearly exhibited an upward trend from the M1 group to the M3 group before showing a modest decline at the M4 group (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1C</bold>
</xref>).</p>
<fig id="f1" position="float">
<label>Figure&#xa0;1</label>
<caption>
<p>Bacterial community compositions and diversities of cigar tobacco phyllosphere. <bold>(A)</bold> Principal coordinate analysis (PCoA) illustrating the effects of different time series (T1, T2, T3 and T4) on the cigar tobacco phyllospheric bacterial community; <bold>(B)</bold> Venn diagrams illustrating number of shared or unique OTUs in each time series group (M1, M2, M3 and M4); <bold>(C)</bold> Alpha diversity indexes of cigar tobacco phyllosphere bacterial communities in each time series group (M1, M2, M3 and M4); <bold>(D)</bold> Bar chart illustrating bacterial community composition at the class level; <bold>(E)</bold> Bar chart illustrating bacterial community composition at the order level; <bold>(F)</bold> Bar chart illustrating bacterial community composition at the genus level.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g001.tif"/>
</fig>
<p>Alphaproteobacteria, Sphingobacteria, Clostridia, Gammaproteobacteria and Bacilli were the predominant classes (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1D</bold>
</xref>); Enterobacterales, Pseudomonadales, Sphingobacteriales, Clostridiales, Lactobacillales, Rhodospirillales, Alteromonadales, Flavobacteriales, Sphingomonadales, Burkholderiales, and Rhizobiales were the dominant bacterial orders (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1E</bold>
</xref>); Finally, <italic>Pseudomonas, Stenotrophomonas, Enterobacter, Acinetobacter, Lactococcus, Enterococcus, Clostridium</italic> and <italic>Sphingobacterium</italic> were the dominant bacterial genra (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1F</bold>
</xref>). Additionally, the bacterial community structure of cigar tobacco in current study is significantly distinct from that of fine-tuned tobacco that we previously reported (<xref ref-type="bibr" rid="B87">Wang Z. et&#xa0;al., 2022</xref>) upon partial least squares-discriminant analysis (PLS-DA), which aligns with the notion that host genotype affect the composition of microbial holobiont (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Figure S2</bold>
</xref>). The PLS-DA model was validated by a permutation test: R2 intercept = 0.370 and Q2 intercept = -0.402. The PLS-DA models appeared to be reasonably predictable based on the negative Q2 intercept. Bacteria affiliated with <italic>Sphingobacterium, Pantoea, Herminiimonas, Acinetobacter, Lactococcus, Enterococcus</italic>, <italic>Erwinia, Pseudomonas</italic> and <italic>Pediococcus</italic> ranked the top 15 variable importance in projection (VIP), indicating them as the statistically significant taxa for the microbiota classification.</p>
<p>LEfSe (Linear discriminant analysis Effect Size) analysis was used to identify the differential taxa in each group in order to further ascertain the changes in the makeup of the bacterial community throughout time series (<xref ref-type="fig" rid="f2">
<bold>Figure&#xa0;2A</bold>
</xref>). The importance of bacterial biomarkers in each group is positively connected with the linear discriminant analysis (LDA) score (<xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3</bold>
</xref>). In comparison, M1 group exhibits enrichment of genra such as <italic>Sphingobacterium</italic> (LDA =5.33), <italic>Pseudoxanthomonas</italic> (LDA =3.99), and <italic>Sphingomonas</italic> (LDA =3.83). <italic>Sphingobacterium</italic> and <italic>Sphingomonas</italic> are aerobic foliar and phytohormone-producing bacterium capable of protecting plants from foliar diseases caused by <italic>Pseudomonas syringae</italic> (the wildfire disease pathogen) via substrate competition (<xref ref-type="bibr" rid="B84">Vogel et&#xa0;al., 2012</xref>). <italic>In vitro</italic> plant growth-promoting characteristics, such as phosphate solubilization, IAA synthesis, and ACC deaminase activity, were demonstrated by <italic>Sphingomonas</italic> isolates (<xref ref-type="bibr" rid="B40">Jin et&#xa0;al., 2023</xref>).</p>
<fig id="f2" position="float">
<label>Figure&#xa0;2</label>
<caption>
<p>Analysis of microbial differences between groups. <bold>(A)</bold> The linear discriminant analysis effect size (LEfSe) analysis at species level of bacterial communities (with LDA score &gt;3.1 and p &lt; 0.05) among M1, M2, M3 and M4 groups presented by cladogram and distribution histogram; <bold>(B)</bold> Comparison of disease incidence rate (IR) and disease index (DI) among groups (top) with asterisks indicate significance; *<italic>p</italic> &lt; 0.05;  **<italic>p</italic> &lt; 0.01; ****<italic>p</italic> &lt; 0.001; ns, not significant. Random forest analysis showing genra contributed to the wildfire disease index (bottom).</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g002.tif"/>
</fig>
<fig id="f3" position="float">
<label>Figure&#xa0;3</label>
<caption>
<p>Analyses on factors that impacted the relative abundance and occurrence frequency of microbes in cigar tobacco phyllosphere. <bold>(A)</bold> Fit of the neutral community model (NCM) of community assembly. The OTUs more frequently present than predicted are in cyan, whereas those less frequently are in red. The blue dashed lines represent 95% confidence intervals around the model prediction and the OTUs fallen into the confidence intervals are regarded as neutrally distributed. Nm indicates the meta-community size times immigration, Rsqr indicates the fit to the neutral model. Neutral processes are the part within 95% confidence interval (red) while non-neutral are the parts including above and below prediction (dark green); <bold>(B)</bold> Comparison of incidence-based (Raup-Crick) beta-diversity (&#x3b2;<sub>RC</sub>) among groups; <bold>(C)</bold> Niche breadth comparison; <bold>(D)</bold> The partial Mantel tests showing the relationships between climate and disease indexes and plant associated microbes; Correlations were shown by the depth of colors, the significance showed with numbers; *<italic>p</italic> &lt; 0.05; **<italic>p</italic> &lt; 0.01; ***<italic>p</italic> &lt; 0.001; <bold>(E)</bold> Redundancy analysis (RDA) of the relationships between bacterial community in tobacco leaves and environmental variables, including morbidity variables (disease incidence rate: IR, and disease index: DI) and climatic factors (temperature: TEMP, humidity: HM, and rainfall capacity: RC); <bold>(F)</bold> Variance partitioning analysis (VPA) showing contributions of morbidity and climatic variables to tobacco phyllospheric bacterial community variation.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g003.tif"/>
</fig>
<p>At the same time, M2 group shows enrichment of bacterial genra such as <italic>Acinetobacter</italic> (LDA =4.98), <italic>Pediococcus</italic> (LDA =4.69), and <italic>Lactiplantibacillus</italic> (LDA =3.39). Notably, the M3 period, which comparatively has a higher disease incidence rate (IR) and disease index (DI) than other groups (<xref ref-type="fig" rid="f2">
<bold>Figure&#xa0;2B</bold>
</xref>), shows significant enrichment of many bacterial genra of opportunistic pathogens, including <italic>Enterobacter</italic> (LDA =5.21), <italic>Pseudomonas</italic> (LDA =5.16), <italic>Pantoea</italic> (LDA =4.43), <italic>Klebsiella</italic> (LDA =4.37), <italic>Escherichia_Shigella</italic> (LDA =4.08), <italic>Dickeya</italic> (LDA =4.07), <italic>Erwinia</italic> (LDA =3.79) and <italic>Pectobacterium</italic> (LDA =3.46). Consistently, the random forest analysis indicated that genra <italic>Pseudomonas</italic>, <italic>Sphingobacterium</italic>, <italic>Enterobacter</italic>, <italic>Saccharibacillus</italic> and <italic>Enterococcus</italic> contributed greatly (top 5 MSE score) to the wildfire disease index (<xref ref-type="fig" rid="f2">
<bold>Figure&#xa0;2B</bold>
</xref>). Lastly, M4 group shows enrichment of bacterial orders of Clostridiales (LDA =5.53), Lactobacillales (LDA =5.56), and Bacillales (LDA =4.32). These bacteria often considered to be plant-beneficial and antagonistic against phytopathogens (<xref ref-type="bibr" rid="B2">Ahmed et&#xa0;al., 2022</xref>; <xref ref-type="bibr" rid="B37">Jaffar et&#xa0;al., 2023</xref>).</p>
<p>An established technique for inferring stochastic processes associated with community assembly is the neutral community model (NCM), which has proven useful in the explanation of a number of ecological phenomena (<xref ref-type="bibr" rid="B69">Roguet et&#xa0;al., 2015</xref>). This model could quantify the significance of processes that are not easy to observe directly but might have a great impact on microbial communities (i.e., dispersal and ecological drift). In our study, the NCM has predicted 54.9%, 63.0%, 35.9% and 36.1% of the relation between the occurrence frequency of OTUs and the relative abundance for M1, M2, M3 and M4 groups, respectively (<xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3A</bold>
</xref>). Consistently, the incidence-based (Raup-Crick) beta-diversity (&#x3b2;<sub>RC</sub>) values increased rapidly at M3 and thereafter decreased at M4 period, but they remained within the &#x2018;stochastic&#x2019; range (&#x2212;0.95&#x2009;&lt;&#x2009;&#x3b2;<sub>RC</sub>&#x2009;&lt;&#x2009;+&#x2009;0.95) (<xref ref-type="bibr" rid="B82">Vass et&#xa0;al., 2020</xref>) (<xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3B</bold>
</xref>). Consistently, the estimated niche width of M3 group is relatively greater than that of other groups (<xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3C</bold>
</xref>). Besides, the Nm value followed a gradual downtrend from M1 (567) to M4 (211), indicating that the species dispersal on tested plant phyllosphere decreased as time go by (<xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3A</bold>
</xref>).</p>
<p>The partial Mantel tests were used to explore the relationships between climate and disease indexes and plant associated microbes (<xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3D</bold>
</xref>). The compositions of main bacterial taxa such as those belonging to Pseudomonadales were significantly correlate with the disease index (DI, <italic>r&#x2009;</italic>&gt;&#x2009;0.4, <italic>p</italic>&#x2009;&lt;&#x2009;0.01). Redundancy analysis (RDA) was further applied to reveal the relationship between phyllospheric bacterial populations and factors (<xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3E</bold>
</xref>). RDA results showed that morbidity variables, including wildfire disease incidence rate (IR) and disease index (DI), are positively correlated with temperature (TEMP), humidity (HM) and rainfall capacity (RC). In addition, <italic>Pseudomonas syringae</italic> (OTU2), the pathogen of bacterial wildfire disease, and <italic>Enterococcus</italic> (OTU3), a kind of gram-positive and opportunistic pathogen (<xref ref-type="bibr" rid="B20">Dickel et&#xa0;al., 2018</xref>), were also positively correlated (contributing) to the disease index (DI). In the contrary, negatively correlated to the DI and these pathogenic taxa were genra such as <italic>Acinetobacter, Sphingobacterium</italic> and <italic>Lactococcus</italic>, indicating that they are the potential disease biocontrol agents (<xref ref-type="bibr" rid="B36">Ikeda et&#xa0;al., 2023</xref>; <xref ref-type="bibr" rid="B37">Jaffar et&#xa0;al., 2023</xref>). Overall, the morbidity (IR, DI) and climatic factors (TEMP, HM, RC) have significantly affected the phyllospheric bacterial community. Variance partitioning analysis (VPA) further showed that the complete set of the morbidity and climatic variables together could explain 2.5% of the variation of the tested phyllospheric bacterial communities, with climatic variables contributing more than morbidity (<xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3F</bold>
</xref>). The high proportion of unexplained variation in VPA also suggested the potential importance of neutral or stochastic processes during community assembly.</p>
</sec>
<sec id="s2_2">
<title>The predicted function profiles of microbiomes are influenced by disease</title>
<p>In order to investigate the effects of (a)biotic factors on the community functions of different periods, metagenomes of bacterial communities were predicted using PICRUSt2 and then annotated by referring to the KEGG database. A total of 7,281 KEGG Orthologs (KOs) were predicted in the phyllosphere-associated communities. PCoA analysis at the KO level showed that community functions of different time series significantly differed from each other (ANOSIM, R<sup>2&#xa0;=&#xa0;</sup>0.513, P &lt; 0.001), suggesting that the bacterial wildfire disease also had a significant effect on microbiome functions of different time (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Figure S3</bold>
</xref>). C, N, S cycling, secretion and adaption related genes showed a varied pattern among the phyllosphere bacterial communities (<xref ref-type="fig" rid="f4">
<bold>Figure&#xa0;4</bold>
</xref>).</p>
<fig id="f4" position="float">
<label>Figure&#xa0;4</label>
<caption>
<p>PICRUSt-predicted metagenome functions at KO level with significant different abundance among groups.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g004.tif"/>
</fig>
<p>Specifically, functional genes more abundant in the M3 microbiome were involved in Secretion system (acting as virulence factor, such as genes encoding the conjugal transfer pilus assembly proteins Tra and Hof), Carbohydrate metabolism (e.g. Pentose phosphate pathway, Amino sugar and nucleotide sugar metabolism) and Energy metabolism (e.g. Carbon fixation, Sulfur metabolism), as well as genes related with osmotic stress resistance (e.g. <italic>otsAB, opuC</italic>). We proposed that these genes enriched in the M3, a period when the plant wildfire disease index reached climax (<xref ref-type="fig" rid="f2">
<bold>Figure&#xa0;2B</bold>
</xref>), were related with the deterioration of wildfire disease (more secretion of virulence factor), the enhanced metabolic capacity and environmental adaption. Similar observation was also reported previously (<xref ref-type="bibr" rid="B88">Wang et al., 2022</xref>). In comparison, functional genes more abundant in the M4 microbiome were involved in Glycolysis/Gluconeogenesis (e.g. <italic>porB</italic> and <italic>porD</italic>), Glycan metabolism (e.g. <italic>exoHKVQXY</italic>) and Sporulation (e.g. <italic>spoVK, yndF</italic>, and <italic>cotSA</italic>). These sporulation genes may represent an adaptive strategy that enables bacteria to survive harsh environmental conditions (e.g., depleted nutrient on old leaves) for prolonged periods of time (<xref ref-type="fig" rid="f4">
<bold>Figure&#xa0;4</bold>
</xref>).</p>
</sec>
<sec id="s2_3">
<title>Characteristics of microbial interaction through co-occurrence network</title>
<p>Molecular ecological networks (MENs) are built and visualized to investigate the impact of combinations of bacterial wildfire disease and climatic factors on microbial interactions across the distinct time periods. The aim was to gain a deeper insight into the interactions among phylospheric microorganisms. Analysis revealed that the four networks exhibited significantly different structures, highlighting the diverse impact of bacterial wildfire disease and climatic factors on microbial interactions across time (<xref ref-type="fig" rid="f5">
<bold>Figure&#xa0;5A</bold>
</xref>). This observation provides valuable insights into the dynamic nature of these interactions in response to environmental changes. The number of nodes in the MENs exhibits an increasing trend from M1 (188) to M3 (424), followed by a slight decrease at M4 (325). This tendency is also found in MEN properties such as the network diameter, modularity, average path length, and connected components (a maximal set of nodes such that each pair of nodes is connected by a path). In comparison, the edge numbers increase sharply from M1 (960) and M2 (793) to M3 (4,488) and M4 (12,706). Similar trend is also found in MEN properties such as average (weighted) degree, clustering coefficient, and network density (comparison between the edges available in a graph and a graph with all possible edges) (<xref ref-type="fig" rid="f5">
<bold>Figure&#xa0;5B</bold>
</xref>). The portion of positive correlation also followed an increase trend from M1 (77.3%) to M3 (96.1%). The positive correlation thereafter slightly decreased at M4 (79.8%).</p>
<fig id="f5" position="float">
<label>Figure&#xa0;5</label>
<caption>
<p>Molecular ecological networks of phyllospheric bacterial community of different groups. <bold>(A)</bold> Visualization of separate and overall molecular ecological networks. Each node represents an OUT; The size of each node is proportional to the number of connections (degree) and the colors of nodes represent different bacterial order (top) or module (bottom). The links between the nodes indicate strong and significant (<italic>r &gt;</italic>0.7, <italic>p</italic> &lt; 0.05) correlations; <bold>(B)</bold> Molecular ecological network properties of the four groups.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g005.tif"/>
</fig>
<p>Additionally, the average path lengths range from 2.39 to 4.49 (<xref ref-type="fig" rid="f5">
<bold>Figure&#xa0;5B</bold>
</xref>), exhibiting the network properties of typical small world with all nodes highly interlinked within the networks (<xref ref-type="bibr" rid="B90">Watts and Strogatz, 1998</xref>). The bacterial taxa Clostridiales (18.2%-27.8%), Pseudomonadales (6.2%-11.6%), Lactobacillales (6.1%-12.1%), Sphingobacteriales (2.8%-11.7%), Bacillales (3.8%-15.1%), Enterobacterales (3.7%-23.4%), Rhizobiales (4.3%-6.4%), Burkholderiales (4.3%-7.4%) always predominate the nodes of the MENs.</p>
<p>Following the results of MENs, we further test if the correlating bacterial pairs within the MEN have the possibility to share functional genes. Namely, the available genomes of phyllosphere bacterial isolates were used to detect putative HGT events from the correlating taxa in MENs. Interestingly, we have unraveled 139 entries of such HGT events (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>) and we further perform phylogenetic reconstruction on representative horizontally transferred genes (HTGs) to verify the accuracy of HGT inferences.</p>
<p>These HTGs putatively confer adaptive functions to opportunistic plant-associated pathogenic microorganisms in the following categories:</p>
<p>(A) Enter/degrade host tissue:</p>
<p>Plant-associated pathogens degrade plant cell wall structures for energy and for gaining entry to the host. In current study, the identified HGT events related to these functions include:</p>
<p>(i) Lytic murein transglycosylase. This enzyme is found to be shared among plant-associated microbes of Pseudomonadales (e.g. the wildfire disease pathogen <italic>Pseudomonas syringae</italic>) from sampling sites like diseased soybean/<italic>Coriandrum sativum</italic> leaflet and Burkholderiales (e.g. the rhizosphere species <italic>Burkholderia hospita</italic>) from sampling sites like forest soil (<xref ref-type="fig" rid="f6">
<bold>Figure&#xa0;6A</bold>
</xref>). This is corresponding to 322 links in the overall MEN between <italic>Burkholderia</italic> and <italic>Pseudomonas</italic>. Lytic murein transglycosylase is a type of autolysin that exerts virulence by breaking the &#x3b2;-1,4 glycosidic bond between N-acetylmuramic acid and N-acetylglucosamine residues within the host peptidoglycan (<xref ref-type="bibr" rid="B52">Liu et&#xa0;al., 2012</xref>);</p>
<fig id="f6" position="float">
<label>Figure&#xa0;6</label>
<caption>
<p>Phylogenetic analyses of the representative horizontally transferred genes related to host tissue entrance and nutrient utilization in this study (red color) with the closest sequences from Genbank database. The trees were constructed with PhyML; the branch length is proportional to the number of substitutions per site: <bold>(A)</bold> Lytic transglycosylase; <bold>(B)</bold> Type IV secretion system protein VirB3; <bold>(C)</bold> Cell filamentation protein; <bold>(D)</bold> dTDP-glucose 4,6-dehydratase.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g006.tif"/>
</fig>
<p>(ii) Type IV secretion system protein VirB3. This protein is found to be shared among plant-associated pathogens belonging to <italic>Pseudomonas, Xanthomonas</italic> and <italic>Pantoea</italic>, which inhabit the plant phyloplane and leaf surface, highlighting their potential role in intercellular communication and host manipulation (<xref ref-type="fig" rid="f6">
<bold>Figure&#xa0;6B</bold>
</xref>). This observation, corresponding to 541 links in the MEN among these three genra, underscores the significance of the type IV secretion system in facilitating pathogenic processes and contributing to disease (<xref ref-type="bibr" rid="B14">Christie et&#xa0;al., 2005</xref>). VirB3, which shares similarities with the pilin-like TraL protein involved in T-pilus assembly, represents a conserved component of this secretion system (<xref ref-type="bibr" rid="B57">Mossey et&#xa0;al., 2010</xref>).</p>
<p>In addition to the secretion system, other key mechanisms have been identified in plant-associated microbes. For instance, <italic>Pseudomonas</italic> spp. have been observed to utilize their flagellar apparatus to attach to and reach more favorable niches on the plant surface (<xref ref-type="bibr" rid="B32">Haefele and Lindow, 1987</xref>). This finding is consistent with the current study, which reveals the sharing of cell filamentation protein between Betaproteobacteria and Gammaproteobacteria strains (<xref ref-type="fig" rid="f6">
<bold>Figure&#xa0;6C</bold>
</xref>). Furthermore, the study identifies several other proteins, such as TrbB, TraO, TraD, and TraQ-like protein, which are involved in host attachment and virulence, and that are shared among plant-associated microbes in the MENs (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>).</p>
<p>Apart from the flagellar apparatus implicated in host attachment, it is also noteworthy that esterase/lipase genes, known for their involvement in cleaving the cuticle layer of the cell wall under the regulation of quorum-sensing, were found to be shared among plant-associated microorganisms like <italic>Sphingomonas, Bradyrhizobium</italic>, and <italic>Paenibacillus</italic> (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>). Biofilm formation plays an important role in the colonization, abiotic resistance, and virulence of microbial community (<xref ref-type="bibr" rid="B88">Wang W. H. et&#xa0;al., 2022</xref>). Align with this, our study reveals the gene transmission of dTDP-glucose 4,6-dehydratase (RmlB) between plant-associated <italic>Methylobacterium</italic> and <italic>Sphingomonas</italic>, which are inhabitants of the wheat phyllosphere (<xref ref-type="fig" rid="f6">
<bold>Figure&#xa0;6D</bold>
</xref>).</p>
<p>(B) Ingest and utilization of nutrients from host:</p>
<p>A Ca<sup>2+</sup>-binding protein of the repeats in toxin (RTX) family, which causes the leakage of host cellular content through producing pore on the targeted cell membranes (<xref ref-type="bibr" rid="B60">Ostolaza et&#xa0;al., 2019</xref>), was found to be transferred among phytopathogens (<xref ref-type="fig" rid="f7">
<bold>Figure&#xa0;7A</bold>
</xref>).</p>
<fig id="f7" position="float">
<label>Figure&#xa0;7</label>
<caption>
<p>Phylogenetic analyses of the representative horizontally transferred genes related to responses to host defense in this study (red color) with the closest sequences from Genbank database. The trees were constructed with PhyML: <bold>(A)</bold> Ca<sup>2+</sup>-binding protein, RTX toxin-related; <bold>(B)</bold> Bile acid:Na<sup>+</sup> symporter; <bold>(C)</bold> Arginine:ornithine antiporter/lysine permease; <bold>(D)</bold> Spermidine/putrescine transport system (substrate-binding).</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g007.tif"/>
</fig>
<p>This study further supports the importance of HGT in shaping nutrient acquisition strategies in plant-associated microorganisms, as abundant HGT of transporter-encoding genes has been identified in microbes present in the MEN. The horizontally transferred genes identified are associated with the transport of nutrients including D-glucose, cellobiose, D-methionine, arabinose, nitrate/nitrite, raffinose/stachyose/melibiose, and more (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>). To validate the representative horizontally transferred genes (HTGs), phylogeny inference was conducted on HTGs such as the bile acid:Na<sup>+</sup> symporter (BASS) family (<italic>Variovorax-Stenotrophomonas</italic>) involved in the transport of Met-derived glucosinolates (<xref ref-type="bibr" rid="B25">Facchinelli and Weber, 2011</xref>), the spermidine/putrescine transport system (Hyphomicrobiales-Burkholderiales-Pseudomonadales) and the arginine:ornithine antiporter/lysine permease (Burkholderiales-Xanthomonadales) (<xref ref-type="fig" rid="f7">
<bold>Figures&#xa0;7B-D</bold>
</xref>).</p>
<p>(C) Counteract, Subvert, or Manipulate Host Pathways:</p>
<p>Upon recognizing an invading pathogen, plant cells activate multiple defense responses, including producing ROS (reactive oxygen species) and secreting antimicrobial toxins. Inhibition of the plant&#x2019;s oxidative burst is crucial for the successful infection of several biotrophic and hemibiotrophic phytopathogens (<xref ref-type="bibr" rid="B29">Fu et&#xa0;al., 2022</xref>). In current study, HGT events of antioxidant enzymes that neutralize the reactive oxygen species were identified (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>). For example, a catechol 2,3-dioxygenase was found to be shared between <italic>Stenotrophomonas</italic> and <italic>Variovorax</italic> that inhabit plant phyllosphere/fallen leaves (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8A</bold>
</xref>), in correspondence to 21 links in the MEN between these taxa; a protein-disulfide isomerase was found to be shared between <italic>Stenotrophomonas</italic> and <italic>Achromobacter</italic> that inhabit sorghum phyllosphere/maize root (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8B</bold>
</xref>), in correspondence to 30 links in the MEN between these taxa; a glutathione S-transferase was found to be shared between <italic>Variovorax</italic> and <italic>Pseudomonas</italic> that inhabit switchgrass leaf surface/forest soil (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8C</bold>
</xref>), in correspondence to 21 links in the MEN between these taxa. In addition, genes encoding peroxiredoxin (<italic>Stenotrophomonas-Achromobacter</italic>, 30 links in the MEN), ferredoxin (<italic>Acidovorax-Bradyrhizobium</italic>, a links in the MEN), Dyp-type peroxidase family (<italic>Sphingomonas-Cupriavidus</italic>, 52 links in the MEN), D-methionine (an antioxidant) transport system (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8D</bold>
</xref>, <italic>Pectobacterium-Paenibacillus</italic>, 338 links in the MEN) and non-heme chloroperoxidase (<italic>Rhizobium-Sphingomonas</italic>, 46 links in the MEN) were predicted to be shared by plant-associated microbes (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>).</p>
<fig id="f8" position="float">
<label>Figure&#xa0;8</label>
<caption>
<p>Phylogenetic analyses of the representative horizontally transferred genes related to responses to host defense in this study (red color) with the closest sequences from Genbank database. The trees were constructed with PhyML: <bold>(A)</bold> Catechol 2,3-dioxygenase-like lactoylglutathione lyase; <bold>(B)</bold> Protein-disulfide isomerase; <bold>(C)</bold> Glutathione S-transferase; <bold>(D)</bold> Methionine transport system permease; <bold>(E)</bold> Cytochrome P450; <bold>(F)</bold> Poly-beta-1,6-N-acetylglucosamine synthase-like glycosyltransferase; <bold>(G)</bold> Iron(III) transport system permease; <bold>(H)</bold> ABC-type cobalamin/Fe<sup>3+</sup>-siderophores transport systems, ATPase.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g008.tif"/>
</fig>
<p>In order to overcome the inhibitory effects of antimicrobial toxins produced by plants, phytopathogens have developed strategies to break down these compounds using secreted enzymes (<xref ref-type="bibr" rid="B55">Maor and Shirasu, 2005</xref>). For example, the pea pathogen <italic>Nectria haematococca</italic> encodes a cytochrome P450 enzyme responsible for the detoxification of the pea-produced phytoalexin pisatin (<xref ref-type="bibr" rid="B54">Maloney and VanEtten, 1994</xref>), and its discontinuous distribution supports the hypothesis of HGT (<xref ref-type="bibr" rid="B79">Temporini and VanEtten, 2004</xref>). Consistently, genes encoding cytochrome P450 were identified to be shared between <italic>Acidovorax</italic> and <italic>Rhizobium</italic> from root nodule and the phyllosphere of <italic>Agrostis stolonifera</italic> (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8E</bold>
</xref>).</p>
<p>Glycosyltransferase is involved in the detoxification of organic toxics generated upon plant infections (<xref ref-type="bibr" rid="B62">Poppenberger et&#xa0;al., 2003</xref>; <xref ref-type="bibr" rid="B73">Sep&#xfa;lveda-Jim&#xe9;nez et&#xa0;al., 2005</xref>). Consistently, genes encoding glycosyltransferase family were widely identified in plant-associated microbes (n=4, <xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>). For example, phylogenetic analysis showed that species of Enterobacterales (Gammaproteobacteria) and Burkholderiales (Betaproteobacteria) that inhabit plant environments (phyllosphere/rhizosphere/endophyte) share a poly-beta-1,6-N-acetylglucosamine synthase-like glycosyltransferase via cross-class HGT (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8F</bold>
</xref>).</p>
<p>Siderophores are important in iron biogeochemical cycling in soils, pathogen competition, plant growth promotion and cross-kingdom signaling (<xref ref-type="bibr" rid="B30">Gu et&#xa0;al., 2020</xref>). Correspondently, components of cobalamin/Fe<sup>3+</sup>-siderophores transport systems and iron(III) transport system were found to be shared by pathogenic microbes inhabiting plant-associated environments, such as <italic>Pseudomonas syringae</italic> and <italic>Ralstonia solanacearum</italic> (<xref ref-type="fig" rid="f8">
<bold>Figures&#xa0;8G, H</bold>
</xref>). <italic>Ralstonia solanacearum</italic> is a soilborne phytopathogen that causes bacterial wilt and substantial yield losses in many plants (<xref ref-type="bibr" rid="B96">Yin et&#xa0;al., 2022</xref>).</p>
<p>(D) Abiotic Stresse Resistance</p>
<p>Plant-surface microorganisms frequently encounter challenging abiotic stresses due to fluctuations in climate, such as osmotic stress, sun exposure, and exposure to antimicrobial drugs like antibiotics and chemicals containing metal ions. HGT events play a crucial role in helping these microorganisms adapt to these harsh conditions (<xref ref-type="bibr" rid="B48">Li L. et al., 2022</xref>).</p>
<p>Several examples of HGT events related to osmotic stress resistance have been identified (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>). These HGT events include (<xref ref-type="fig" rid="f9">
<bold>Figures&#xa0;9A-C</bold>
</xref>): the osmoprotectant transport system ATP-binding protein (<italic>Pseudomonas-Agrobacterium</italic>, 338 links in the MEN), the sodium:proton antiporter (<italic>Pseudomonas-Erwinia</italic>, 445 links in the MEN), and the bile acid:Na<sup>+</sup> symporter (<italic>Variovorax-Stenotrophomonas</italic>, 12 links in the MEN); HGT events associated with DNA repair and radiation resistance, such as the restriction endonuclease NotI (<italic>Pseudomonas-Xanthomonas</italic>, 319 links in the MEN); In terms of antimicrobial resistance, HGT events encompass a range of mechanisms involved in antibiotics inactivation and efflux (<xref ref-type="fig" rid="f9">
<bold>Figure&#xa0;9D-G</bold>
</xref>), such as streptomycin 3&#x2019;-adenylyltransferase (<italic>Luteimonas-Pseudomonas</italic>, 319 links in the MEN), nitroreductase (<italic>Xanthomonas-Pseudomonas</italic>), a well-documented resistance factor (<xref ref-type="bibr" rid="B58">M&#xfc;ller et&#xa0;al., 2015</xref>), and amidase (<italic>Xanthomonas-Pseudomonas</italic>), as well as the multidrug efflux pumps (S<italic>tenotrophomonas-Variovorax</italic>).</p>
<fig id="f9" position="float">
<label>Figure&#xa0;9</label>
<caption>
<p>Phylogenetic analyses of the representative horizontally transferred genes related to responses to host defense in this study (red color) with the closest sequences from Genbank database. The trees were constructed with PhyML: <bold>(A)</bold> Osmoprotectant transport system ATP-binding protein; <bold>(B)</bold> Sodium:proton antiporter; <bold>(C)</bold> Restriction endonuclease NotI; <bold>(D)</bold> Streptomycin 3&#x2019;-adenylyltransferase; <bold>(E)</bold> Nitroreductase; <bold>(F)</bold> Amidase; <bold>(G)</bold> Multidrug efflux pump.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g009.tif"/>
</fig>
<p>Additionally, genes conferring resistance to antimicrobial chemicals containing metal ions, such as the chromate efflux transporter (<italic>Luteimonas-Pseudomonas</italic>), copper resistance protein B (<italic>Luteimonas-Pseudomonas</italic>), Cu<sup>+</sup>-exporting ATPase (<italic>Methylobacterium-Roseomonas</italic>, 6 links in the MEN) and mercuric ion transport protein MerT (<italic>Ralstonia-Pseudomonas</italic>, 324 links in the MEN), have also been horizontally transferred (<xref ref-type="fig" rid="f10">
<bold>Figure&#xa0;10A-D</bold>
</xref>).</p>
<fig id="f10" position="float">
<label>Figure&#xa0;10</label>
<caption>
<p>Phylogenetic analyses of the representative horizontally transferred genes related to abiotic stresse resistance in this study (red color) with the closest sequences from Genbank database. The trees were constructed with PhyML: <bold>(A)</bold> Chromate efflux transporter; <bold>(B)</bold> Copper resistance protein B; <bold>(C)</bold> Cu<sup>+</sup>-exporting ATPase; <bold>(D)</bold> Mercuric ion transport protein MerT; <bold>(E)</bold> ppGpp synthetase/RelA/SpoT-type nucleotidyltranferase.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1331443-g010.tif"/>
</fig>
<p>Furthermore, the ppGpp synthetase/RelA/SpoT-type nucleotidyltranferase that participates in the stringent response is shared between <italic>Pectobacterium</italic> and <italic>Pseudomonas</italic> (326 links in the MEN); the starvation-inducible DNA-binding protein is shared between <italic>Rhizobium</italic> and <italic>Sphingomonas</italic>; The transcriptional regulator (MerR) is shared between <italic>Stenotrophomonas</italic> and <italic>Sphingobium</italic> (22 links in the MEN), as well as between <italic>Xanthomonas</italic> and <italic>Pseudomonas</italic> (319 links in the MEN). These proteins are additional examples of HGT events related to holistic response to abiotic stress resistance (<xref ref-type="fig" rid="f10">
<bold>Figure&#xa0;10E</bold>
</xref>).</p>
</sec>
</sec>
<sec id="s3" sec-type="discussion">
<title>Discussion</title>
<p>
<italic>Pseudomonas</italic> and <italic>Enterobacter</italic> affiliated microbes could be a primary factor that affecting the plant disease development. It was demonstrated that the two highly conserved effectors of <italic>Pseudomonas syringae</italic>, AvrE and HopM1, require high moisture on establishing the aqueous apoplast (<xref ref-type="bibr" rid="B93">Xin et&#xa0;al., 2016</xref>). In the phyllosphere, members of the <italic>Enterobacter</italic> genus can reproduce quickly, form aggregates when there is plenty of moisture, and respond sensitively to changes in the humidity on plant surfaces (<xref ref-type="bibr" rid="B8">Brandl and Mandrell, 2002</xref>; <xref ref-type="bibr" rid="B7">Brandl, 2006</xref>; <xref ref-type="bibr" rid="B91">Whipps et&#xa0;al., 2008</xref>). The Enterobacterial genra, <italic>Pectobacterium</italic> and <italic>Dickeya</italic>, are well-characterized plant pathogens that cause blackleg in tobacco and soft rot in Chinese cabbage, potato, and other crops (<xref ref-type="bibr" rid="B53">Ma et&#xa0;al., 2007</xref>). Consistently, these taxa were significantly enriched in the M3 period. On the other hand, Bacterial populations associated with the Clostridiales, Lactobacillales, and Bacillales orders have been identified as beneficial for plant growth. The recruitment of Bacillales in plant associated niche was reported to be induced by the plant exudation for disease suppression (<xref ref-type="bibr" rid="B98">Zhou et&#xa0;al., 2023</xref>). The existence of these bacteria in the M4 period may represent tobacco&#x2019;s response mechanism to attract microorganisms during biotic stressors like pathogen invasion and unfavorable climatic conditions (<xref ref-type="bibr" rid="B12">Chen et&#xa0;al., 2014</xref>). Similarly, the relative abundances of Clostridiales, Bacillales, Lactobacillales (<xref ref-type="bibr" rid="B2">Ahmed et&#xa0;al., 2022</xref>; <xref ref-type="bibr" rid="B37">Jaffar et&#xa0;al., 2023</xref>), and Sphingobacteriales (<xref ref-type="bibr" rid="B36">Ikeda et&#xa0;al., 2023</xref>), which are often considered to be plant-beneficial and antagonistic microbes, showed significant decrease in severally diseased sample (M3) compared to the pre-diseased samples (M1/M2) in the MENs. This might be seen as the plant&#x2019;s &#x201c;cry for help&#x201d; mechanism to lessen the effects of these stresses (<xref ref-type="bibr" rid="B89">Wang and Song, 2022</xref>).</p>
<p>The NCM has successfully predicted a significant portion of the community variance, indicating that stochasticity plays a more crucial role than determinism in shaping the tobacco phyllospheric bacterial community. Specifically, M1 and M2 groups demonstrated a higher NCM prediction fraction compared to M3 and M4 groups, suggesting that stochasticity is dominant in the early stages of community establishment, while deterministic processes become increasingly important over time in plant-related habitats (<xref ref-type="bibr" rid="B22">Dini-Andreote et&#xa0;al., 2015</xref>). This can be attributed to the critical influence of amino acids on stochastic processes in plant leaves for environmental selection (<xref ref-type="bibr" rid="B94">Xu et&#xa0;al., 2023</xref>). MENs of M3 and M4 demonstrate increased complexity, with abundant interactions in a highly connected microbial community. This suggests an increase in cooperative and facilitative interactions between pathogens and compatible microbes, potentially contributing to disease development (<xref ref-type="bibr" rid="B2">Ahmed et&#xa0;al., 2022</xref>). This could be attributed to the peak in rainfall and humidity during the M3 period (corresponding to August) at the sampling site, as indicated by data from the national meteorological center of China (<ext-link ext-link-type="uri" xlink:href="http://www.nmc.cn/">http://www.nmc.cn/</ext-link>). These conditions likely provided an optimal environment for microbial growth and the formation of connections. We further analyze the structural robustness of MENs (M1, M2, M3, and M4) by calculating their natural connectivity (<xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Figure S4</bold>
</xref>). A higher natural connectivity indicates a more structurally robust network (<xref ref-type="bibr" rid="B47">Li F. et&#xa0;al., 2022</xref>). Considering that real networks may experience node failures, we simulate random node failures by randomly removing nodes in our analysis. The natural connectivity of M1, M2, M3, and M4 in a network without node failures is 0.24, 0.27, 0.66, and 0.21, respectively. When approximately half of the nodes are removed, the natural connectivity of M3 is 61.5%, 68.0%, and 61.7% higher than that of M1, M2, and M4, respectively. This indicates that M3 topology possesses superior structural robustness and is more stable compared to other topologies. The natural connectivity algorithm reflects the communication links between nodes in reality. As a result, M3 topology&#x2019;s higher structural robustness is expected to translate into better performance in real-world networks, where nodes may fail due to various reasons. In contrast, M1, M2, and M4 topologies lack the redundancy of M3. When nodes fail in these topologies, there are fewer alternative paths for nodes to take, leading to a more significant disruption of communication. Overall, the superior structural robustness of M3 makes it a more reliable and stable topology for various network applications. Consistent with our findings, a study by <xref ref-type="bibr" rid="B34">Hu et&#xa0;al. (2020)</xref> revealed that the rhizosphere and endophytic compartments of infected tobacco were more complex compared to those of healthy tobacco. Similarly, a higher level of connections was also observed in the wilt-diseased rhizoplane of tobacco compared to healthy samples (<xref ref-type="bibr" rid="B2">Ahmed et&#xa0;al., 2022</xref>; <xref ref-type="bibr" rid="B77">Tao et&#xa0;al., 2022</xref>).</p>
<p>HGT may also be significant in shaping the genetic repertoire and adaptive traits of plant-associated bacteria across the MENs, particularly in relation to host colonization, and pathogenicity. We have unraveled 139 entries of HGT events between the correlating bacterial pairs within the MEN that suggest the possibility to share functional genes. The validity of the HGT direction and identification during the inference process may be concerns. To allay these worries, we have included in our analysis the &#x201c;gold standard&#x201d; confirmation for the identified HGT genes: phylogenetic incongruence, which occurs when the evolutionary tree of a given protein family differs from the known organismal phylogeny, indicates that a given gene has been acquired through HGT from a different lineage (<xref ref-type="bibr" rid="B71">Schonknecht et&#xa0;al., 2014</xref>). For instance, the well-supported phylogenetic tree of methionine transport system permease illustrates that the protein sequences from <italic>Pectobacterium</italic> sp. (Proteobacteria) embedded within sequences from <italic>Paenibacillus</italic> sp. and <italic>Bacillus</italic> sp. (Firmicutes) (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8D</bold>
</xref>). Cross-phylum HGT originating from Firmicutes to Proteobacteria is the most economical explanation for this phylogenetic pattern.</p>
<p>Our study has identified abundant virulence-related HTGs. Consistently, there is evidence supports the notion that enzymes that degrades cell wall are often horizontally transferred among microbes to interact with host plants, as shown in previous studies (<xref ref-type="bibr" rid="B38">James et&#xa0;al., 2006</xref>; <xref ref-type="bibr" rid="B67">Richards et&#xa0;al., 2011</xref>; <xref ref-type="bibr" rid="B10">Chaib De Mares et&#xa0;al., 2015</xref>). The plant wildfire pathogen <italic>Pseudomonas syringae</italic> has been observed to involve prophages in transferring genes that encode Type III secreted effector (T3SE) proteins, which contribute to the evolution of pathogenic virulence (<xref ref-type="bibr" rid="B35">Hulin et&#xa0;al., 2023</xref>). Furthermore, the existence of Type IV secretion systems in transmissible bacterial plasmid with diverse excretion functions, including the delivery of toxic proteins by pathogens, further emphasizes their versatility and significance in host-pathogen interactions (<xref ref-type="bibr" rid="B78">Tauch et&#xa0;al., 2002</xref>). The presence of exogenously acquired DNA and pathogenicity determinants in the genome of the plant wilt pathogen <italic>Ralstonia solanacearum</italic> further emphasizes the role of HGT in the evolution of plant-associated pathogens (<xref ref-type="bibr" rid="B70">Salanoubat et&#xa0;al., 2002</xref>). Likewise, genomic differences correlated with virulence and host-range functions have been identified in phytopathogenic <italic>Xanthomonas</italic> species, underscoring the importance of HGT in shaping niche-adaptive traits (<xref ref-type="bibr" rid="B16">Da Silva et&#xa0;al., 2002</xref>). In the case of <italic>Pectobacterium atrosepticum</italic>, planta colonization promotes the transfer of integrative and conjugative elements, and leads to the acquisition of virulence genes (<xref ref-type="bibr" rid="B81">Vanga et&#xa0;al., 2015</xref>). Moreover, HGT has been proposed as a contributing factor to the adaption of <italic>Erwinia tracheiphila</italic>, the bacterial wilt pathogen affecting cucurbits (<xref ref-type="bibr" rid="B74">Shapiro et&#xa0;al., 2016</xref>). The prediction of the transmission of an alpha-1,2-mannosidase between <italic>Stenotrophomonas</italic> and <italic>Sphingomonas</italic> (75 links in the MEN, <xref ref-type="supplementary-material" rid="SM1">
<bold>Supplementary Table S1</bold>
</xref>) and cell-wall-degrading enzymes in current study is also noteworthy. This mannitol metabolic enzyme associates with growth and pathogenicity in phytopathogens (<xref ref-type="bibr" rid="B83">V&#xe9;l&#xeb;z et&#xa0;al., 2008</xref>) and can trim host glycoproteins (<xref ref-type="bibr" rid="B65">Reichenbach et&#xa0;al., 2018</xref>). Its exclusive transfer among distantly related phytopathogenic fungi further supports the significance of this enzyme (<xref ref-type="bibr" rid="B63">Qiu et&#xa0;al., 2016</xref>). The findings align with previous researches that highlight the function of these genes in the enzymatic modification and breakdown of the cell wall and to evade plant defenses (<xref ref-type="bibr" rid="B85">Voigt et&#xa0;al., 2005</xref>; <xref ref-type="bibr" rid="B19">Devescovi et&#xa0;al., 2007</xref>; <xref ref-type="bibr" rid="B26">Feng et&#xa0;al., 2009</xref>; <xref ref-type="bibr" rid="B51">Liu et&#xa0;al., 2018</xref>). RmlB is an enzyme associated with the formation of rhamnose-containing biofilms and the virulence of pathogenic bacteria (<xref ref-type="bibr" rid="B72">Sen et&#xa0;al., 2011</xref>). This prediction corresponds to the presence of 50 links in the MEN. Plant-associated microbes generally detect and respond to signals received from plants, including organic acid and sugar from exudate, and begin to colonize. Microorganisms utilize their flagella to navigate towards the plant once a signal is detected. Subsequently, bacteria adhere to the plant surface and form the biofilms (<xref ref-type="bibr" rid="B17">Delmotte et&#xa0;al., 2009</xref>). These findings underscore the multifaceted strategies employed by plant-related microorganisms to interact with their host plants. Biofilm formation facilitates the establishment and persistence of microbial communities, contributing to colonization, abiotic resistance, and virulence. Meanwhile, chemotaxis allows microorganisms to detect and respond to plant signals, aiding in their movement towards the plant surface. The presence of genes associated with flagella assembly, bacterial motility, and biofilm formation further supports the concept of biofilm-mediated colonization and the formation of complex microbial communities in the phyllosphere and stem settings. These collective adaptations enable plant-associated microbes to thrive and interact synergistically with their plant hosts.</p>
<p>The availability of nutrient compounds on leaves plays a crucial role in the colonization of the phyllosphere by bacterial populations (<xref ref-type="bibr" rid="B50">Lindow and Brandl, 2003</xref>). The release of small quantities of nutrients, including simple sugars like glucose, fructose, and sucrose, from the plant&#x2019;s core has been observed (<xref ref-type="bibr" rid="B50">Lindow and Brandl, 2003</xref>). Consistently, we have detected abundant nutrient transport related HTGs. the nutrient acquisition strategies of plant-associated osmotrophic microbes heavily rely on the array of plasma membrane transporters they encode. Through HGT, these microbes can acquire novel transporter genes, expanding their nutrient repertoire and enabling them to occupy new ecological niches, ultimately giving them competitive advantages over other microorganisms from the same niches (<xref ref-type="bibr" rid="B68">Richards and Talbot, 2013</xref>). Polyamines like arginine and putrescine, in addition to serving as a source of essential and osmoprotectant amino acids, also function as signaling molecules that enable the microbiome to detect the presence of eukaryotic hosts (<xref ref-type="bibr" rid="B39">Jim&#xe9;nez-Bremont et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B51">Liu et&#xa0;al., 2018</xref>). Plant-associated microbial species alter their lifestyle upon detecting these compounds, promoting adhesion and biofilm development as a means to evade plant defenses. This response allows the microbes to establish a closer relationship with their host plants by forming biofilms that enhance their persistence and resistance to plant immune mechanisms (<xref ref-type="bibr" rid="B39">Jim&#xe9;nez-Bremont et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B51">Liu et&#xa0;al., 2018</xref>). This highlights the importance of HGT in shaping the evolution of microbial nutrient acquisition strategies, and suggests that plant-associated microbes may share common mechanisms for acquiring nutrients from their environments (<xref ref-type="bibr" rid="B4">Bachhawat et&#xa0;al., 2013</xref>).</p>
<p>Notably, the identified HGT events frequently occur within plant-associated environments, such as the phyllosphere and root. For instance, the sequences of <italic>Stenotrophomonas</italic> spp. inhabiting sorghum phyllosphere and maize root are clustered with <italic>Burkholderia</italic>-affiliated species from similar habitats as seen in the phylogeny of multidrug efflux pump (refer to <xref ref-type="fig" rid="f9">
<bold>Figure&#xa0;9G</bold>
</xref>). This can be explained by the consistent inheritance of conserved core plant microbiomes (holobionts) through seed dispersion or recruitment from the surrounding environments (<xref ref-type="bibr" rid="B1">Agler et&#xa0;al., 2016</xref>). Root microbiomes can rapidly spread to the endorhizosphere through fissures in lateral-root connections or wounds caused by phytopathogen (<xref ref-type="bibr" rid="B18">de Santi Ferrara et&#xa0;al., 2012</xref>). Endophytic bacteria may migrate from root to phyllosphere, where they can develop into local communities (<xref ref-type="bibr" rid="B13">Chi et&#xa0;al., 2005</xref>). In fact, extensive taxonomic and functional overlaps between the plant leaf and root microbial communities were unraveled (<xref ref-type="bibr" rid="B5">Bai et&#xa0;al., 2015</xref>). SourceTracker analysis of tea microbiome revealed high similarities (34%) within the phyllosphere and within the rhizosphere, indicating exchanges between roots and leaves (<xref ref-type="bibr" rid="B94">Xu et&#xa0;al., 2023</xref>). These microbial migration and colonization processes provide opportunities for HGT among plant holobionts, as demonstrated by the phylogenetic proximity of the HGT-affected genes. In addition, HGT can be stimulated by various exuded compounds, such as organic acids and amino acids (<xref ref-type="bibr" rid="B59">Nielsen and van Elsas, 2001</xref>; <xref ref-type="bibr" rid="B42">Kay et&#xa0;al., 2002</xref>).</p>
<p>Overall, these findings emphasized the shared features and mechanisms utilized by plant-associated microorganisms to interact with their host plants. The presence of shared proteins involved in cellular attachment, virulence, and enzymatic breakdown of the cell wall suggests the conserved strategies and adaptations in the microbial ecology of plant-associated pathogens.</p>
</sec>
<sec id="s4" sec-type="materials|methods">
<title>Materials and methods</title>
<sec id="s4_1">
<title>Disease incidence of bacterial wildfire disease</title>
<p>The incidence of bacterial wildfire disease in tobacco was assessed using the standards outlined in the tobacco pest classification and survey methods (GB/T 23222&#x2013;2008) of China. The disease incidence was determined by calculating the percentage of diseased tobacco in each field. Additionally, the disease index was calculated using the formula:</p>
<disp-formula>
<mml:math display="block" id="M1">
<mml:mrow>
<mml:mi>D</mml:mi>
<mml:mi>i</mml:mi>
<mml:mi>s</mml:mi>
<mml:mi>e</mml:mi>
<mml:mi>a</mml:mi>
<mml:mi>s</mml:mi>
<mml:mi>e</mml:mi>
<mml:mtext>&#xa0;</mml:mtext>
<mml:mi>i</mml:mi>
<mml:mi>n</mml:mi>
<mml:mi>d</mml:mi>
<mml:mi>e</mml:mi>
<mml:mi>x</mml:mi>
<mml:mtext>&#xa0;</mml:mtext>
<mml:mo stretchy="false">(</mml:mo>
<mml:mi>D</mml:mi>
<mml:mi>I</mml:mi>
<mml:mo stretchy="false">)</mml:mo>
<mml:mtext>&#xa0;</mml:mtext>
<mml:mo>=</mml:mo>
<mml:mtext>&#xa0;</mml:mtext>
<mml:mrow>
<mml:mo stretchy="false">[</mml:mo>
<mml:mrow>
<mml:mi>&#x3a3;</mml:mi>
<mml:mtext>&#xa0;</mml:mtext>
<mml:mrow>
<mml:mo stretchy="false">(</mml:mo>
<mml:mrow>
<mml:mi>r</mml:mi>
<mml:mo>&#xd7;</mml:mo>
<mml:mi>N</mml:mi>
</mml:mrow>
<mml:mo stretchy="false">)</mml:mo>
</mml:mrow>
<mml:mo stretchy="false">/</mml:mo>
<mml:mrow>
<mml:mo stretchy="false">(</mml:mo>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mo>&#xd7;</mml:mo>
<mml:mi>R</mml:mi>
</mml:mrow>
<mml:mo stretchy="false">)</mml:mo>
</mml:mrow>
</mml:mrow>
<mml:mo stretchy="false">]</mml:mo>
</mml:mrow>
<mml:mo>&#xd7;</mml:mo>
<mml:mn>100</mml:mn>
</mml:mrow>
</mml:math>
</disp-formula>
<p>where r represents the disease severity, N is the number of infected tobaccos with a rating of r, n is the total number of tobaccos tested, and R is the highest disease severity value in each field. Meteorological data were obtained from the National Meteorological Center of China&#x2019;s website (<ext-link ext-link-type="uri" xlink:href="http://www.nmc.cn/">http://www.nmc.cn/</ext-link>).</p>
</sec>
<sec id="s4_2">
<title>Leaf collection method</title>
<p>Leaf samples of cigar tobacco (<italic>Nicotiana tabacum</italic> L) were collected from the Yongding Region, Sangzhi County, Zhangjiajie City, Hunan Province, China (29&#xb0;28&#x2032;3&#x2033;N, 110&#xb0;57&#x2032;51&#x2033;E) at four different time points in 2022: June (M1), July (M2), August (M3), and September (M4). Samples were taken from cigar tobacco fields with varying levels of bacterial wildfire disease, with three plants displaying typical symptoms of the disease sampled from each plot, resulting in a total of three duplicates. The sampling followed a random block pattern, covering a plot area of 90 m<sup>2</sup>, adhering to local planting methods. A total of 18 plants per plot were sampled. To extract foliar microbial DNA, middle leaves from every sixth plant were collected and stored at 4&#xb0;C until transportation back to the laboratory.</p>
</sec>
<sec id="s4_3">
<title>DNA extraction and high-throughput sequencing</title>
<p>To extract the genomic DNA of foliar microorganisms, we collected 15 grams of leaf samples from different areas of the leaf surface, specifically excluding the main and branch veins, using a sterile puncher. The samples were then placed in a 50 mL solution of 0.1% Tween-80 bacterial phosphate buffer (pH 7.0) and shaken for 30 minutes at 170 revolutions per minute (rpm) and 28&#xb0;C. However, the current processing method for our samples may not accurately differentiate between endophytes and epiphytes. The resulting bacterial suspension was collected, and the leaf samples were washed twice more. Afterward, the collected suspensions were centrifuged for 15 minutes at 4&#xb0;C and 10,000 rpm to pellet the microorganisms, which were then washed three times and re-suspended in sterile water. Subsequently, the microorganisms were resuspended in 1 mL of sterile water for DNA extraction, which was performed using the Bacteria Genomic DNA Kit according to the manufacturer&#x2019;s protocol. The 16S rRNA gene&#x2019;s V3/V4 regions were amplified using the specific primer pair 341F (5&#x2019;-CCT ACG GGN GGC WGC AG-3&#x2019;) and 805R (5&#x2019;-GAC TAC HVG GGTATC TAA TCC-3&#x2019;). Finally, the amplicons were sequenced using the Illumina NovaSeq PE250 platform by LC-Bio Technology Co., Ltd (Hang Zhou, Zhejiang Province, China).</p>
</sec>
<sec id="s4_4">
<title>Sequencing processing and statistical analyses</title>
<p>We performed several steps to process the raw sequences. Firstly, the raw sequences were divided into sample libraries using barcodes. Subsequently, low-quality sequences with a quality score (QC) below 20 over a 5-base pair window size were removed using Btrim (<xref ref-type="bibr" rid="B45">Kong, 2011</xref>), and sequences shorter than 100 base pairs were eliminated. Then, the forward and reverse sequences were merged. Any sequences containing ambiguous bases or of incorrect length were excluded, and the remaining sequences were compared against the UNITE v8.2 (<xref ref-type="bibr" rid="B44">K&#xf5;ljalg et&#xa0;al., 2005</xref>) to identify and remove possible chimeras.</p>
<p>Following this, the sequencing fragment lengths were restricted to 200&#x2013;400 base pairs. The UPARSE (<xref ref-type="bibr" rid="B23">Edgar, 2013</xref>) was utilized to cluster and generate operational taxonomic units (OTUs) at a 97% similarity level. To ensure data authenticity, OTUs represented by only one sequence across the entire dataset (global singletons) were removed. All statistical analyses and calculations were conducted using the R (v 3.6.3) statistical platform (<ext-link ext-link-type="uri" xlink:href="http://www.r-project.org">www.r-project.org</ext-link>).</p>
<p>Subsequently, we used analysis of similarities (ANOSIM) to assess significant differences in community dissimilarity and conducted a classification random forest analysis (<xref ref-type="bibr" rid="B97">Yuan et&#xa0;al., 2021</xref>) using the R randomForest package to identify key taxa. We also utilized the incidence-based (Raup-Crick) beta-diversity (&#x3b2;<sub>RC</sub>) to differentiate between deterministic and stochastic assembly processes (<xref ref-type="bibr" rid="B11">Chase, 2010</xref>; <xref ref-type="bibr" rid="B75">Stegen et&#xa0;al., 2013</xref>; <xref ref-type="bibr" rid="B82">Vass et&#xa0;al., 2020</xref>). In addition, we adopted a neutral community model (NCM) to predict the relationship between OTU detection frequencies and their relative abundance across the wider metacommunity, using R (version 3.6.3) to determine the potential importance of stochastic processes on community assembly.</p>
</sec>
<sec id="s4_5">
<title>Network construction and HGT identification</title>
<p>To construct molecular ecological networks (MENs), we calculated correlations between pairwise OTUs that were present in over half of the samples using the SparCC method (<xref ref-type="bibr" rid="B28">Friedman and Alm, 2012</xref>). Only edges with a significant correlation higher than 0.7 (p &lt; 0.01) were retained for network construction. We then evaluated the robustness of the microbial association networks against random and targeted node removals (<xref ref-type="bibr" rid="B3">Albert et&#xa0;al., 2000</xref>), using natural global network connectivity as a reliable measure of network robustness (Wu <xref ref-type="bibr" rid="B41">Jun et&#xa0;al., 2010</xref>). By sequentially removing nodes from the network, we observed how the natural connectivity of the microbial network changed, providing insights into its robustness.</p>
<p>Subsequently, following the results of MENs, we investigated if correlating bacterial pairs within the MENs had the potential to share functional genes. To achieve this, we utilized available genomes of phyllospheric bacterial isolates to detect putative horizontal gene transfer (HGT) events from the correlating taxa in MENs. Identification of horizontally transferred genes in the genomes of bacterial isolates from the phyllosphere was conducted using the Integrated Microbial Genomes Annotation Pipeline (IMGAP) v.5.0 (<xref ref-type="bibr" rid="B56">Markowitz et&#xa0;al., 2010</xref>). Genes in tested genomes were defined as having been horizontally transferred from a distant lineage based on the principle that genes had the best BLASTP hits (highest bit scores) or &gt;90% of the best hits found outside the taxonomic lineage of the tested genome (i.e., from a distant phylum, class, etc.) and with lower-scoring hits or no hits within the lineage.</p>
<p>Furthermore, the phylogeny of various abiotic resistance genes was constructed based on gene-translating protein sequences using the PhyML v.3.0 program (<xref ref-type="bibr" rid="B31">Guindon et&#xa0;al., 2010</xref>) with the Maximum Likelihood (ML) method and 1,000 bootstrap replicates. These sequences were aligned with MUSCLE (<xref ref-type="bibr" rid="B24">Edgar, 2004</xref>) and trimmed with Gblocks (<xref ref-type="bibr" rid="B76">Talavera and Castresana, 2007</xref>) before tree construction, which was then visualized using iTOL (<xref ref-type="bibr" rid="B46">Letunic and Bork, 2021</xref>).</p>
</sec>
</sec>
<sec id="s5" sec-type="conclusions">
<title>Conclusions</title>
<p>Pathogenicity is a multifaceted concept influenced by various factors, including pathogen and host genotypes, environmental stresses, and microbial interactions. Together, these factors determine the plant&#x2019;s response to disease-causing microorganisms. Traditional plant pathology textbooks typically describe the development of plant diseases as reliant on prerequisites such as a microbial pathogen with virulence or pathogenicity factors, a susceptible plant host, and environmental conditions that favor disease progression, such as humidity and temperature. However, recent recognition of the symbiotic or mutualistic relationships between many plants and microorganisms has led to a more nuanced understanding of disease causation. The hypothesis of a pathological microbiome suggests that pathogens are integrated into their biological environment, and the microbiome plays a crucial role in plant health and resistance to pathogens.</p>
<p>Taking into account the complexity of these interactions, a conceptual framework known as the disease tetrahedron has been proposed to encompass the interactions between disease determinants, using biological factors as a fourth dimension. In this framework, disease progression is influenced and moderated by various factors, including vectors that transmit pathogens, environmental factors, and the microbiota that regulate pathogenesis and plant defense. Environmental factors affect not only the host plant but also the pathogens and other biological factors, while biological factors directly influence plant performance, pathogens, and other biological components.</p>
<p>The study&#x2019;s findings revealed distinct clusters formed by four series groups (M1, M2, M3, and M4) within the bacterial community, with the assembly primarily driven by stochastic processes. Predictions using PICRUSt2 showed that genes enriched in the M3 group were associated with disease progression, increased virulence factor secretion, enhanced metabolic capacity, and environmental adaptation. The molecular ecological networks of M3 and M4 demonstrated a higher complexity with numerous interactions within a highly connected microbial community.</p>
<p>The study also found that the abundance of beneficial plant microbes and antagonistic microbes decreased significantly in severely diseased samples (M3) compared to pre-diseased samples (M1/M2), indicating potential implications for disease progression. Furthermore, the study explored the potential for HGT within the bacterial pairs in the MENs and identified 139 instances of such HGT events.</p>
<p>Overall, the study provides valuable insights into the bacterial communities in the phyllosphere, shedding light on the dynamics of plant-microbe interactions. These findings contribute to the development of strategies to manage diseases, promote plant health, and engineer microbiomes to enhance the resilience of plants against foliar bacterial diseases.</p>
</sec>
<sec id="s6" sec-type="data-availability">
<title>Data availability statement</title>
<p>The datasets presented in this study can be found in online repositories. The names of the repository/repositories and accession number(s) can be found below: BioProject, PRJNA1033823</p>
</sec>
<sec id="s7" sec-type="author-contributions">
<title>Author contributions</title>
<p>DP: Supervision, Writing &#x2013; review &amp; editing. ZW: Funding acquisition, Writing &#x2013; review &amp; editing. JT: Writing &#x2013; review &amp; editing. WW: Writing &#x2013; review &amp; editing. SG: Writing &#x2013; review &amp;&#xa0;editing. XD: Writing &#x2013; review &amp; editing. HY: Writing &#x2013; review &amp; editing. LL: Conceptualization, Methodology, Writing &#x2013; original draft, Writing &#x2013; review &amp; editing.</p>
</sec>
</body>
<back>
<sec id="s8" sec-type="funding-information">
<title>Funding</title>
<p>The author(s) declare financial support was received for the research, authorship, and/or publication of this article. The authors declare that this study received funding from Hunan Branch of China National Tobacco Corporation, Zhangjiajie City Company (no. HKF202200143 [202201], H202201040560003). The funder was not involved in the study design, collection, analysis, interpretation of data, the writing of this article, or the decision to submit it for publication.</p>
</sec>
<ack>
<title>Acknowledgments</title>
<p>We are grateful for resources from the High-Performance Computing Center of Central South University.</p>
</ack>
<sec id="s9" sec-type="COI-statement">
<title>Conflict of interest</title>
<p>Author DP, ZW, JT, WW, SG, and XD are employed by Zhangjiajie Tobacco Company of Hunan Province.</p>
<p>The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be constructed as a potential conflict of interest.</p>
</sec>
<sec id="s10" sec-type="disclaimer">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<sec id="s11" sec-type="supplementary-material">
<title>Supplementary material</title>
<p>The Supplementary Material for this article can be found online at: <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fpls.2024.1331443/full#supplementary-material">https://www.frontiersin.org/articles/10.3389/fpls.2024.1331443/full#supplementary-material</ext-link>
</p>
<supplementary-material xlink:href="DataSheet_1.pdf" id="SM1" mimetype="application/pdf"/>
<supplementary-material xlink:href="Table_1.xlsx" id="ST1" mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"/>
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