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Updated: May 23, 2025

Author Spotlight: Soybean Hairy Root Transformation for the Analysis of Gene Function
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Dominant foliar endophytes influence soybean yield and transcriptome.

Ivan Sosa Marquez1,2, Karla Griesbaum3, Lindsay V Clark2,4

  • 1Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States.

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|May 13, 2025
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Summary
This summary is machine-generated.

Plant endophytes like Methylobacterium and Colletotrichum can boost soybean growth, but their benefits depend on soil conditions. Plant responses to these microbes are complex and influenced by their interactions.

Keywords:
MethylobacteriumGlycine maxcontext-dependencyendophytesplant–microbe interactionstranscriptomics

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Area of Science:

  • Plant biology
  • Microbiology
  • Genomics

Background:

  • Plant-associated microorganisms influence nutrient uptake, defense, and growth.
  • While soybean soil microbiomes are studied, foliar endophytes and their impact remain less understood.

Purpose of the Study:

  • To investigate the effects of foliar endophytes Methylobacterium and Colletotrichum on Glycine max (soybean) biomass and fitness.
  • To analyze soybean transcriptomic responses to single and co-inoculation of these endophytes under varying soil conditions.

Main Methods:

  • Soybean plants were inoculated with Methylobacterium and Colletotrichum isolates in sterile and non-sterile soil.
  • RNA sequencing (RNAseq) was used to compare plant gene expression profiles.

Main Results:

  • All endophyte treatments enhanced soybean growth, but only in sterile soil, indicating context-dependent mutualism.
  • Transcriptomic analysis showed that plant defense and stress responses were modulated by endophyte interactions, with Methylobacterium eliciting a strong response influenced by Colletotrichum.

Conclusions:

  • The effects of foliar endophytes on soybean are environmentally dependent, acting as facultative mutualists.
  • Endophyte community composition and soil conditions critically influence plant-microbe interactions and plant responses.