Temporal and spatial interactions modulate soybean microbiome diversity and succession

Partie de:
jeudi 19 déc. 11:20 AM (15 minutes)
Salle EFG

Legume crops and their associated microbiomes are important components of the agricultural ecosystems as they improve soil fertility of annual cropping systems. However, little is known about the successional patterns of these plant-associated microbes. This study focuses on discerning the successional patterns of the soybean microbiome. Plants were grown in environmental chambers and samples were collected at four developmental stages: emergence, growth, flowering, and maturation. Bacterial and fungal communities were assessed with amplicon sequencing on the Illumina Miseq platform. In both communities, -diversity was significantly influenced either by the spatial (where samples were collected) or temporal (when samples were collected) dynamics and their interactions. Conversely, -diversity patterns were influenced by either spatial or temporal dynamics but not their interaction. Diversity measures were highest for the endophyte and rhizosphere communities and lowest for the epiphyte community. Time lag analysis indicated a significant temporal autocorrelation for both communities highlighting the role of the founder community. There was a detected differential enrichment of taxa across various developmental stages, with the highest enrichment occurring during flowering and growth stages for bacterial and fungal communities, respectively. Lastly, only the bacterial community showed a significant degree of nestedness spatially and temporally. Overall, this study shows that there is an influence of the founder community and highlights the directional nature of succession within the soybean microbiome. Understanding successional patterns and processes that influence the microbiome, makes it possible to identify 1) microbes that promote plant health, and 2) key intervention points where the microbiome community can be engineered.

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