Abstract
Acidobacteria are one of the most abundant and ubiquitous bacterial phyla in soil, but the mechanisms underpinning their ecological success remain unknown. Acidobacteria produce copious amounts of extracellular polymeric substances (EPS) with unique sugar composition that can be used as a nutrient source for other microorganisms. Here, we investigated the assembly and potential interactions of the active bacterial and fungal communities in soil treated with the EPS of the Acidobacteria Granulicella sp. strain WH15 (WH15EPS) as a carbon source by the stable isotope probing (SIP) approach during a 35-day period. WH15EPS was mainly assimilated by Planctomycetes, Verrucomicrobia, Ascomycota and Basidiomycota and analysis suggested overall relationships between the kingdoms. Our study revealed active potential interactions between microorganisms in their natural habitat. In addition, the structure of the co-occurrence network of active microorganisms able to metabolize WH15EPS differed from those of the control treatments, demonstrating that hidden potential interactions can be unraveled by more specific and targeted metabolism studies.
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