Unexpected carbon utilization activity of sulfate-reducing microorganisms in temperate and permanently cold marine sediments.

ABSTRACT: Significant amounts of organic carbon in marine sediments are degraded, coupled with sulfate reduction. However, the actual carbon and energy sources used in situ have not been assigned to each group of diverse sulfate-reducing microorganisms (SRM) owing to the microbial and environmental complexity in sediments. Here, we probed microbial activity in temperate and permanently cold marine sediments by using potential SRM substrates, organic fermentation products at very low concentrations (15-30 μM), with RNA-based stable isotope probing. Unexpectedly, SRM were involved only to a minor degree in organic fermentation product mineralization, whereas metal-reducing microbes were dominant. Contrastingly, distinct SRM strongly assimilated 13C-DIC (dissolved inorganic carbon) with H2 as the elect

SUBMITTER: Yin X 

PROVIDER: S-EPMC10811731 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature