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.
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Acknowledgements
This study was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP 2014/03217-3, 2015/00251-9) and Coordenação de Aperfeiçoamento de Pessoal de NÃvel Superior (CAPES 88887.185941/2018-00). Publication 6561 of the Netherlands Institute of Ecology (NIOO-KNAW)
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Mendes, L.W., Mendes, R., Raaijmakers, J.M. et al. Breeding for soil-borne pathogen resistance impacts active rhizosphere microbiome of common bean. ISME J 12, 3038–3042 (2018). https://doi.org/10.1038/s41396-018-0234-6
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DOI: https://doi.org/10.1038/s41396-018-0234-6
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