Breeding for soil-borne pathogen resistance impacts active rhizosphere microbiome of common bean

Lukas W. Mendes (Corresponding author), Rodrigo Mendes, J.M. Raaijmakers, Siu Mui Tsai

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Abstract

Over the past century, plant breeding programs have substantially improved plant growth and health, but have not yet
considered the potential effects on the plant microbiome. Here, we conducted metatranscriptome analysis to determine if and
how breeding for resistance of common bean against the root pathogen Fusarium oxysporum (Fox) affected gene expression
in the rhizobacterial community. Our data revealed that the microbiome of the Fox-resistant cultivar presented a significantly
higher expression of genes associated with nutrient metabolism, motility, chemotaxis, and the biosynthesis of the antifungal
compounds phenazine and colicin V. Network analysis further revealed a more complex community for Fox-resistant
cultivar and indicated Paenibacillus as a keystone genus in the rhizosphere microbiome. We suggest that resistance breeding
in common bean has unintentionally co-selected for plant traits that strengthen the rhizosphere microbiome network structure
and enrich for specific beneficial bacterial genera that express antifungal traits involved in plant protection against infections
by root pathogens.
Original languageEnglish
Pages (from-to)3038-3042
JournalISME Journal
Volume12
Early online date2018
DOIs
Publication statusPublished - 2018

Keywords

  • international

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