- 1State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, China
- 2Department of Integrative Biology, University of Texas at Austin, Austin, TX, United States
- 3State Key Laborary for Conservation & Utilization of Subtropical Agro-Bioresources, College of Agriculture, Guangxi University, Nanning, China
- 4State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
Editorial on the Research Topic
Adaptive evolution of grasses
The grass family, Poaceae, the species-rich plant families, consists of c. 10,000 species including the most economically important plants of modern times, providing over one-half of all dietary energy and comprising about one-third of Earth’s vegetative cover (Group et al., 2001; Bouchenak-Khelladi et al., 2008). It has been suggested that the genomes of Poaceae have evolved at an elevated rate due to the selection imposed by changing environmental conditions and more recent breeding efforts (Edwards and Smith, 2010; Stromberg, 2011). In this special issue “Adaptive Evolution of Grasses” seven articles were published that explore genetic/genomic resources in Poaceae species, discussed the involvements of grass biology in different developmental processes or under various stress, covering outstanding advances in molecular genetic basis of adaptive and agronomic traits in diverse grass research fields. In this editorial, we summarized the main findings of these seven insightful works.
Owing to the booming population, deteriorating environments and degradating farmland, it is imperative to explore new wild grass resources to improve the adaptation of the agroecosystem, ensure sustainable livelihoods and food security (Grassini et al., 2013; Ray et al., 2013). As autotrophic organisms, plants convert light energy into chemical energy, primarily in the form of carbohydrate molecules such as sugar, through photosynthesis to fuel the organism activities (Gifford and Evans, 2003; Jansson et al., 2018). It has been clear that the improvement of photosynthetic efficiency can significantly increase the accumulation of plant assimilations products, and the yields (Zhu et al., 2010; Walker et al., 2016; Li et al., 2022). Shen et al. provided an exhaustive overview of current knowledge on the cultivation of high light efficiency plants, including the research progress and methods in improving the photosynthetic efficiency of plants, and especially highlighted the preliminary exploration in the design of C4 crops by means of genetic engineering (Matsuoka et al., 2001). Based on the future problems and difficulties faced by the cultivation of high light efficiency plants, Shen et al. proposed a strategy for improving breeding efficiency.
Rice is one of the major crops worldwide, feeding over half of the global population (Panda et al., 2021). Shen et al. briefly reviewed the heat signal transmission mechanism of plant and the genetic basis in rice heat-tolerant at present. It is expected that the research on plant heat tolerance will contribute to meeting future global warming. Early seedling vigor (ESV) directly reflects seedling establishment (Rao et al., 2007). Moreover, rice plants with high ESV always show high flooding-tolerant, high competitive advantage over weeds, as well as better nutrient uptake (Luo et al., 2007; Wang et al., 2010; Wang et al., 2021). Ma et al. identified a candidate gene qSL2 by genome-wide association study (GWAS) using 302 international diverse rice accessions. In addition, Ma et al. found qSL2 contributed 3.05% variation across in whole panel and 7.38% variation across the indica subpopulation. Haplotype and RNA-seq analysis between long seedling length (SL) accessions and short SL accessions suggested LOC_Os02g17780 (OsCPS1) may be the candidate gene of qSL2, which participates in GA biosynthesis. The research article provides a novel major QTL (qSL2) for ESV, which shows promising potential for direct seeding.
Epigenetic modifications, which include DNA methylation, post-translational modification of histone protein, and smallRNA (siRNA) biogenesis, play a pivotal role in regulation of plant development and response to biotic/abiotic stresses (Mirouze and Paszkowski, 2011; Baulcombe and Dean, 2014; Schmid et al., 2018; Liang et al., 2020). Hexaploid wheat (Triticum aestivum L.), one of the major cereal crops accounting for about a quarter of global cereal production, is sensitive to biotic/abiotic stresses (Tack et al., 2015; Yadav et al., 2022).
However, the knowledge of epigenetic modifications is still limited in plants (Agarwal et al., 2020). Wang et al. performed a comprehensive analysis of JmjC genes which encode demethylases that are involved in histone demethylation. A total of 24 wheat JmjC genes were identified and reported to be conserved in A, B, and D subgenomes. Furthermore, JmjC genes were proposed to play significant role in improving tolerance to drought stress in wheat. Likewise, Lu et al. identified 9 Fes1s genes in hexaploid wheat which are key components of heat shock protein 70 system. In Arabidopsis and rice, Fe1p homologues are reported to be involved in abiotic stresses (Zhang et al., 2010; Fu et al., 2020; Qian et al., 2021). Lu et al. found that overexpression of TaFes1A-5A and TaFes1A-5D could not complement the thermotolerance defect in Arabidopsis thermosensitive fes1a mutant,but could accelerate seed germination under both normal and heat stress conditions. The results of all these works further expand our knowledge of epigenetic modifications in response to abiotic stress.
Herbicide tolerance in grasses is more crucial than that in other plants in the modern agriculture (Powles and Yu, 2010). Epigenetic modifications are also known to regulate gene expression in adaptation of weedy grass species to the herbicide stress (Lu et al., 2016; Pan et al., 2022). Sen et al. reviewed the potential contributions and current challenges of epigenetic mechanisms in adaptive responses of grass-weedy species to herbicidal stress.
Over the recent decades, plant breeding has greatly benefited by the high-throughput sequencing technologies. The transcriptome sequencing technology in plants plays more advantageous role in molecular breeding even in absence of a reference genome (Zhang et al., 2018; Guo et al., 2021; Shaw et al., 2021). Xiong et al. reported full-length transcriptome sequence of K. melanthera by single-molecule real-time sequencing technology. Consequently, a total of 42,433 SSR markers were identified and 21 SSR markers showed good cross-species transferability among 56 K. melanthera accessions. Haque et al. demonstrated that coastal genotypes show superior salinity-tolerance and ion homeostasis compared to inland populations of Panicum hallii. Haque et al. further identified several QTLs associated with salinity-tolerance, and several differentially expressed candidate genes are included various ion transporters by genome-wide transcriptome analysis. Nevertheless, a causal relationship between these observations requires further investigation. These studies pave the way to conduct further molecular breeding research in grass, and provide valuable information for future evolutionary and genetic studies in abiotic stress tolerance in grasses. Overall, the articles published in this special issue are excellent examples of the recent advances made in the genetic evolution and local adaptation in grasses. We thank all the authors for their contributions and critical assessment on the issues. We also thank the Assistant Editor Ms. Lily Wyatt for providing us with the opportunity to serve as the Guest Editor or Topic Coordinator of this special issue “Adaptive Evolution of Grasses.”
Author contributions
All the authors participated in the editing of this Research Topic. XL and ZL wrote the draft, and all the other authors provided suggestive comments on the editorial. All authors contributed to the article and approved the submitted version
Funding
This project was funded by grants from the National Natural Science Foundation of China (32201805) and China Postdoctoral Science Foundation (2022M713431).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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References
Agarwal, G., Kudapa, H., Ramalingam, A., Choudhary, D., Sinha, P., Garg, V., et al. (2020). Epigenetics and epigenomics: underlying mechanisms, relevance, and implications in crop improvement. Funct. Integr. Genomics 20 (6), 739–761. doi: 10.1007/s10142-020-00756-7
Baulcombe, D. C., Dean, C. (2014). Epigenetic regulation in plant responses to the environment. Cold Spring Harb. Perspect. Biol. 6 (9), a019471. doi: 10.1101/cshperspect.a019471
Bouchenak-Khelladi, Y., Salamin, N., Savolainen, V., Forest, F., van der Bank, M., Chase, M. W., et al. (2008). Large Multi-gene phylogenetic trees of the grasses (Poaceae): Progress towards complete tribal and generic level sampling. Mol. Phylogenet. Evol. 47 (2), 488–505. doi: 10.1016/j.ympev.2008.01.035
Edwards, E. J., Smith, S. A. (2010). Phylogenetic analyses reveal the shady history of C4 grasses. Proc Natl Acad Sci U. S. A., 107 (6) 2532–2537. doi: 10.1073/pnas.0909672107
Fu, C., Liu, X., Li, X., Huo, P., Ge, J., Hou, Y., et al. (2020). BRF negatively regulates thermotolerance defect of fes1a in arabidopsis. Front. Plant Sci. 11, 171. doi: 10.3389/fpls.2020.00171
Gifford, R. M., Evans, L. T. (2003). Photosynthesis, carbon partitioning, and yield. Annu. Rev. Plant Physiol. 32 (1), 485–509. doi: 10.1146/annurev.pp.32.060181.002413
Grassini, P., Eskridge, K. M., Cassman, K. G. (2013). Distinguishing between yield advances and yield plateaus in historical crop production trends. Nat. Commun. 4, 2918. doi: 10.1038/ncomms3918
Group, G. P. W., Barker, N. P., Clark, L. G., Davis, J. I., Duvall, M. R., Guala, G. F., et al. (2001). Phylogeny and subfamilial classification of the grasses (Poaceae). Ann. Missouri Botanical Garden 88 (3), 373–457. doi: 10.2307/3298585
Guo, K., Chen, J., Niu, Y., Lin, X. (2021). Full-length transcriptome sequencing provides insights into flavonoid biosynthesis in fritillaria hupehensis. Life (Basel) 11 (4), 287. doi: 10.3390/life11040287
Jansson, C., Vogel, J., Hazen, S., Brutnell, T., Mockler, T. (2018). Climate-smart crops with enhanced photosynthesis. J. Exp. Bot. 69 (16), 3801–3809. doi: 10.1093/jxb/ery213
Li, Z., Wei, X., Tong, X., Zhao, J., Liu, X., Wang, H., et al. (2022). The OsNAC23-Tre6P-SnRK1a feed-forward loop regulates sugar homeostasis and grain yield in rice. Mol. Plant 15 (4), 706–722. doi: 10.1016/j.molp.2022.01.016
Liang, Z., Riaz, A., Chachar, S., Ding, Y., Du, H., Gu, X. (2020). Epigenetic modifications of mRNA and DNA in plants. Mol. Plant 13 (1), 14–30. doi: 10.1016/j.molp.2019.12.007
Lu, Y. C., Feng, S. J., Zhang, J. J., Luo, F., Zhang, S., Yang, H. (2016). Genome-wide identification of DNA methylation provides insights into the association of gene expression in rice exposed to pesticide atrazine. Sci. Rep. 6 (1), 18985. doi: 10.1038/srep18985
Luo, J., Tang, S., Hu, P., Louis, A., Jiao, G., Tang, J. (2007). Analysis on factors affecting seedling establishment in rice. Rice Sci. 14 (1), 27–32. doi: 10.1016/S1672-6308(07)60005-5
Matsuoka, M., Furbank, R. T., Fukayama, H., Miyao, M. (2001). Molecular engineering of C4 photosynthesis. Annu. Rev. Plant Physiol. Plant Mol. Biol. 52 (1), 297–314. doi: 10.1146/annurev.arplant.52.1.297
Mirouze, M., Paszkowski, J. (2011). Epigenetic contribution to stress adaptation in plants. Curr. Opin. Plant Biol. 14 (3), 267–274. doi: 10.1016/j.pbi.2011.03.004
Pan, L., Guo, Q., Wang, J., Shi, L., Yang, X., Zhou, Y., et al. (2022). CYP81A68 confers metabolic resistance to ALS and ACCase-inhibiting herbicides and its epigenetic regulation in echinochloa crus-galli. J. Hazardous Materials 428, 128225. doi: 10.1016/j.jhazmat.2022.128225
Panda, D., Mishra, S. S., Behera, P. K. (2021). Drought tolerance in rice: Focus on recent mechanisms and approaches. Rice Sci. 28 (2), 119–132. doi: 10.1016/j.rsci.2021.01.002
Powles, S. B., Yu, Q. (2010). Evolution in action: Plants resistant to herbicides. Annu. Rev. Plant Biol. 61 (1), 317–347. doi: 10.1146/annurev-arplant-042809-112119
Qian, D., Xiong, S., Li, M., Tian, L., Qing Qu, L. (2021). OsFes1C, a potential nucleotide exchange factor for OsBiP1, is involved in the ER and salt stress responses. Plant Physiol. 187 (1), 396–408. doi: 10.1093/plphys/kiab263
Rao, A. N., Johnson, D. E., Sivaprasad, B., Ladha, J. K., Mortimer, A. M. (2007). Weed management in direct-seeded rice. Adv. Agron. 93, 153–255. doi: 10.1016/S0065-2113(06)93004-1
Ray, D. K., Mueller, N. D., West, P. C., Foley, J. A. (2013). Yield trends are insufficient to double global crop production by 2050. PloS One 8 (6), e66428. doi: 10.1371/journal.pone.0066428
Schmid, M. W., Heichinger, C., Coman Schmid, D., Guthörl, D., Gagliardini, V., Bruggmann, R., et al. (2018). Contribution of epigenetic variation to adaptation in arabidopsis. Nat. Commun. 9 (1), 4446. doi: 10.1038/s41467-018-06932-5
Shaw, R., Tian, X., Xu, J. (2021). Single-cell transcriptome analysis in plants: Advances and challenges. Mol. Plant 14 (1), 115–126. doi: 10.1016/j.molp.2020.10.012
Stromberg, C. A. E. (2011). Evolution of grasses and grassland ecosystems. Annu. Rev. Earth and Pl Sc. 39, 517–544. doi: 10.1146/annurev-earth-040809-152402
Tack, J., Barkley, A., Nalley, L. L. (2015). Effect of warming temperatures on US wheat yields. Proc. Natl. Acad. Sci. U. S. A.112 (22). 6931–6936. doi: 10.1073/pnas.1415181112
Walker, B. J., VanLoocke, A., Bernacchi, C. J., Ort, D. R. (2016). The costs of photorespiration to food production now and in the future. Annu. Rev. Plant Biol. 67 (1), 107–129. doi: 10.1146/annurev-arplant-043015-111709
Wang, Z., Wang, J., Bao, Y., Wang, F., Zhang, H. (2010). Quantitative trait loci analysis for rice seed vigor during the germination stage. J. Zhejiang Univ. Sci. B 11 (12), 958–964. doi: 10.1631/jzus.B1000238
Wang, H., Hou, Y., Wang, S., Tong, X., Wang, Y. (2021). WRKY72 negatively regulates seed germination through interfering gibberellin pathway in rice. Rice Sci. 28 (1), 1–5. doi: 10.1016/j.rsci.2020.11.001
Yadav, M. R., Choudhary, M., Singh, J., Lal, M. K., Jha, P. K., Udawat, P., et al. (2022). Impacts, tolerance, adaptation, and mitigation of heat stress on wheat under changing climates. Int. J. Mol. Sci. 23 (5), 2838. doi: 10.3390/ijms23052838
Zhang, J. X., Wang, C., Yang, C. Y., Wang, J. Y., Chen, L., Bao, X. M., et al. (2010). The role of arabidopsis AtFes1A in cytosolic Hsp70 stability and abiotic stress tolerance. Plant J. 62 (4), 539–548. doi: 10.1111/j.1365-313X.2010.04173.x
Zhang, B., Liu, J., Wang, X., Wei, Z. (2018). Full-length RNA sequencing reveals unique transcriptome composition in bermudagrass. Plant Physiol. Biochem. 132, 95–103. doi: 10.1016/j.plaphy.2018.08.039
Keywords: grasses, Poaceae, adaptive evolution, genomics, molecular breeding
Citation: Liu X, Weng X, Edwards J, Wang L, Zhang C, Qiu J and Li Z (2023) Editorial: Adaptive evolution of grasses. Front. Plant Sci. 14:1105320. doi: 10.3389/fpls.2023.1105320
Received: 22 November 2022; Accepted: 20 January 2023;
Published: 30 January 2023.
Edited by:
Manjusha Verma, National Bureau of Plant Genetic Resources (ICAR), IndiaReviewed by:
Suresh Kumar, Indian Agricultural Research Institute (ICAR), IndiaMatthew Paul, Rothamsted Research, United Kingdom
Copyright © 2023 Liu, Weng, Edwards, Wang, Zhang, Qiu and Li. 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.
*Correspondence: Zhiyong Li, lzhy1418@163.com