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Poster

Session: Session 1 Presenting Authors at Posters (Odds)

P-303 - Temporal and spatial variations in the microbiome of the wild grass species Agrostis capillaris under different vegetation management practices

Monday, July 14, 2025
13:30 - 15:15  
Location: Confex Hall 3
Population Biology, Ecology & Genomics
In natural ecosystems, the plant microbiome is especially known to have major impact on ecosystem’s performance and dynamics, as well as improving plant stress resilience. Microbial functions mainly depend on the microbial community diversity and composition, which itself is influenced by numerous environmental factors. So far, the dynamics of microbiomes in natural plant populations are poorly described beyond studies in the model plant Arabidopsis thaliana. Through the study of the grass species Agrostis capillaris, we aim to explore the dynamic of microbial communities and to characterize how vegetation management impact the microbiome diversity and composition. We analyzed the microbiome diversity, composition and community structure in leaves and roots, and looked at the impact of mowing and grazing on the A. capillaris microbiome for 3 consecutive years. Our results highlight diversity differences under the different management practices. Moreover, bacterial and fungal communities follow different patterns across time and plant tissues. Finally, the community structure analysis allowed us to identify several fungal and bacterial pathogenic species among the most connected individuals in the leaf microbiome communities, including species of Zymoseptoria. This study represents a first step for investigating the mechanisms shaping the plant microbiome in natural ecosystems, as well as identifying potential future pathogenic species that could threaten crops.