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Soil microbial diversity: A key factor in pathogen suppression and inoculant performance.

Caroline Sayuri Nishisaka1,2, Hélio Danilo Quevedo1,2, João Paulo Ventura1,2

  • 1Embrapa Environment, Jaguariúna, SP, Brazil.

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|August 8, 2025
PubMed
Summary

Soil microbial diversity impacts biocontrol efficacy. The biocontrol bacterium Pseudomonas inefficax effectively suppressed Bipolaris sorokiniana disease in low-diversity soils, highlighting the role of soil microbiome complexity in plant health.

Keywords:
Bipolaris sorokinianaChitinophagaceaeDilution-to-extinctionPseudomonas inefficax strain CMAA1741Rhizosphere microbiomeSoil-borne pathogen

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Area of Science:

  • Agricultural Science
  • Microbiology
  • Plant Pathology

Background:

  • Soil microbial diversity is integral to plant health and disease suppression.
  • Understanding the interplay between soil microbial communities, pathogens, and biocontrol agents is crucial for sustainable agriculture.

Purpose of the Study:

  • To investigate how varying soil microbial diversity levels influence the efficacy of Pseudomonas inefficax as a biocontrol agent against the pathogen Bipolaris sorokiniana in wheat.
  • To elucidate the impact of microbial diversity on disease severity, plant growth, and rhizosphere microbiome composition.

Main Methods:

  • A dilution-to-extinction method was used to create five distinct soil microbial diversity levels.
  • Wheat plants were inoculated with Bipolaris sorokiniana and Pseudomonas inefficax across these diversity gradients.
  • Disease severity, plant growth, and rhizosphere microbial community structure were analyzed.

Main Results:

  • Pseudomonas inefficax significantly reduced Bipolaris sorokiniana disease severity, particularly in soils with low microbial diversity.
  • Low-diversity soils showed higher pathogen abundance but effective disease control by P. inefficax, suggesting reduced microbial competition.
  • Distinct shifts in rhizosphere microbiome composition were observed across diversity gradients, with specific taxa like Fluviicola enriched in low-diversity soils with P. inefficax.

Conclusions:

  • Soil microbial diversity critically modulates the effectiveness of biocontrol strategies.
  • Simplified soil microbial communities may enhance the efficacy of specific biocontrol agents like Pseudomonas inefficax.
  • The findings highlight the importance of considering soil microbiome context for successful biocontrol implementation in agriculture.