: Effect of associated perennial species on septoria regulation and wheat microbiome

Le résumé fourni par la source

Septoria is a very common wheat disease in temperate zones and it is responsible for major yield losses. Crop association can have beneficial effects on disease regulation and can modify plant-microbiome. We are studying the association of wheat crops with different grasslands, with or without legumes, in the fields experiments of Clermont-Ferrand. The evolution of the incidence of septoria symptoms is studied on plots naturally contaminated by septoria or inoculated with Z.tritici spores. In both cases, wheat in association has fewer symptoms incidence that in monoculture for two wheat varieties. Moreover, here, we examined the microbial communities of the roots, the rhizosphere, and the bulk soil in the wheat monoculture compared with association. We found that cereal-legume association did not modify the microbial alpha diversity compared to the monoculture system. However, cereal-legume association changed beta-diversity and relative abundance of key bacteria family like Pseudomonadaceae, Bacillaceae and Rhizobiaceae. Certain families that are more abundant in the wheat-prairie association are identified as containing Plant Growth Promoting Rhizobacteria. Overall, this association has a positive effect on the regulation of septoria and on the wheat microbiome. However, fast-growing grasslands have deleterious effects on wheat height and nutrition. Further research is needed to find more complementary combinations of grassland and wheat species in terms of resource acquisition. These findings provided new information about wheat microbiome and septoria regulation in culture association systems and promoted this new agricultural system.

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