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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Microbiol. | doi: 10.3389/fmicb.2019.01668

Consortium of Plant Growth-Promoting Rhizobacteria Strains Suppresses Sweet Pepper Disease by Altering the Rhizosphere Microbiota

 J-H Guo1*, Lina Zhang1,  Dacheng Wang1, Qiang Hu1, Xiangqun Dai1, Yuesheng Xie1, Qing Li2 and Huamei Liu2
  • 1Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, China
  • 2Wuhan Kernel Bio-tech Co., Ltd, China

Beneficial microorganisms have been used extensively to make plants more resistant to abiotic and biotic stress. We previously identified a consortium of three plant growth-promoting rhizobacteria (PGPR) strains (Bacillus cereus AR156, Bacillus subtilis SM21, and Serratia sp. XY21; hereafter “BBS”) as a promising and environmentally friendly biocontrol agent. In this study, the effect of BBS on a soil-borne disease of sweet pepper was evaluated. Application of BBS significantly reduced the prevalence of phytophthora blight and improved fruit quality and soil properties relative to the control. BBS was able to alter the soil bacterial community: it significantly increased the abundances of Burkholderia, Comamonas, and Ramlibacter, which were negatively associated with disease severity, relative to the control. Redundancy analysis suggested that BBS-treated soil samples were dominated by Burkholderia, Comamonas, Ramlibacter, Sporichthya, Achromobacter and Pontibacter; abundance of these genera was related to total organic carbon (TOC), total nitrogen (TN), ammonium nitrogen (AN), total potassium (TP) and available phosphorus (AP) contents. This suggests that BBS treatment shifted the microbe community to one that suppressed soil-borne disease and improved the soil chemical properties.

Keywords: BBS, Rhizosphere soils, sweet pepper, Disease prevalence, soil properties

Received: 12 Mar 2019; Accepted: 05 Jul 2019.

Edited by:

Helena Freitas, Center for Functional Ecology, University of Coimbra, Portugal

Reviewed by:

Yitzhak Hadar, Hebrew University of Jerusalem, Israel
Vijay S. Meena, ICAR-Vivekananda Parvatiya Krishi Anusandhan Sansthan, India  

Copyright: © 2019 Guo, Zhang, Wang, Hu, Dai, Xie, Li and Liu. 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: Prof. J-H Guo, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China, dacheng0819@126.com