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

Front. Plant Sci. | doi: 10.3389/fpls.2019.01038

Decoding wheat endosphere-rhizosphere microbiomes in Rhizoctonia solani infested soils challenged by Streptomyces biocontrol agents

  • 1Flinders University, Australia
  • 2United States Department of Agriculture (USDA), United States
  • 3South Australian Research and Development Institute, Australia

The endosphere and the rhizosphere are pertinent milieus with microbial communities that perturb the agronomic traits of crop plants through beneficial or detrimental interactions. In this study we challenged these communities by adding Streptomyces biocontrol strains to wheat seeds in soils with severe Rhizoctonia solani infestation. Wheat plants were grown in a glasshouse standardized system and the bacterial and fungal microbiome of 233 samples of wheat roots (endosphere) and rhizosphere soils were monitored for 20 weeks, from seed to mature plant stage. The results showed highly dynamic and diverse microbial communities that changed over time, with Sphingomonas bacteria and Aspergillus, Dipodascus and Trichoderma fungi increasing over time. Application of biocontrol Streptomyces strains promoted plant growth and maturation of wheat heads and modulated the root microbiome, decreasing Paenibacillus and increasing other bacterial and fungal OTUs. The soils with the highest levels of R. solani had increased reads of Thanatephorus (Rhizoctonia anamorph) and increased root disease levels and increased Balneimonas, Massilia, Pseudomonas and unclassified Micrococcaceae. As we enter the era of biologically sustainable agriculture it may be possible to reduce and limit the effects of serious fungal infestations by promoting a beneficial microbiome through the application of biocontrol agents during different periods of plant development.

Keywords: 16S biodiversity, biocontrol agent, cereal microbiology, endophyte, ITS1 biodiversity, Paenibacillus, plant microbiome, Streptomyces

Received: 03 Apr 2019; Accepted: 24 Jul 2019.

Edited by:

Kalliope K. Papadopoulou, University of Thessaly, Greece

Reviewed by:

Sotirios Vasileiadis, University of Thessaly, Greece
Rita Grosch, Leibniz Institute of Vegetable and Ornamental Crops, Germany  

Copyright: © 2019 Araujo, Dunlap, Barnett and Franco. 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: Mx. Ricardo Araujo, Flinders University, Adelaide, 5042, South Australia, Australia, ricjparaujo@yahoo.com