alexa The Impact Of Breeding For Pathogen Resistance On The Rhizosphere Microbiome Assembly In Common Bean (Phaseolus Vulgaris L.)
ISSN: 2471-9315

Applied Microbiology: Open Access
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12th International Congress on Microbial Interaction and Applications of Beneficial Microbes
July 17-18, 2017 Munich, Germany

Siu Mui Tsai, Lucas William Mendes, Jos M Raaijmakers, Mattias de Hollander and Rodrigo Mendes
University of Sao Paulo, Brazil
NIOO-KNAW, Netherlands
Leiden University, Netherlands
Brazilian Agricultural Research Corporation, Brazil
Posters & Accepted Abstracts: Appli Micro Open Access
DOI: 10.4172/2471-9315-C1-006
Abstract
The rhizosphere microbiome plays a key role in plant growth and health, providing a first line of defense against pathogen root infection. Here, we investigated how breeding for resistance of common bean (Phaseolus vulgaris L.) to the soil borne pathogen Fusarium oxysporum (Fox) changes the composition and functional potential of the bacterial community when present in a bean rhizosphere. Rhizobacterial abundance was positively correlated with Fox-resistance, tested in four different bean cultivars grown in two contrasting soils. Pseudomonadaceae, Bacillaceae, Solibacteraceae and Cytophagaceae showed highest abundance in the rhizosphere of the resistant cultivar. Network analyses showed a non-modular topology of the rhizosphere microbiome of the Foxresistant cultivar, suggesting a more complex and highly connected bacterial community when compared to the Fox-susceptible cultivar. Further metagenome analyses revealed that specific functional traits such as protein secretion systems and genes involved in the biosynthesis of antifungal phenazines and rhamnolipids were more abundant in the rhizobacterial community of the Fox-resistant cultivar. In conclusion, our findings suggest that breeding for Fox-resistance in common bean co-selected for other unknown plant traits that support a higher abundance of specific beneficial bacterial families in the rhizosphere with functional traits that may reinforce the idea of being as a first line of the plant defense in the soil.
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