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Nitrate in coastal waters: shifting the balance from carbon sink to carbon source

ABSTRACT: Different salt marsh habitats, which are dominated by different plant species, will havedistinct metabolomic profiles that are driven by phyto-compounds released as plantexudates. However, within a given habitat, NO3 - will alter the metabolomic profile such thatthere will be a decrease in the most labile metabolites compared to reference marshes.Rates of decomposition depend on both the availability of a powerful electron acceptor anda supply of labile carbon that can be oxidized. In salt marshes that carbon is largelygenerated by primary production from halophytic plants, which have distinct zonationpatterns based on elevation above mean high water. The root exudates from these plants fuelmicrobial metabolism when there is a sufficient supply of electron acceptors present, but ourpreliminary metabolomic data suggest that different marsh habitats generate different plantexudates, which could largely explain why we see distinct microbial communitieswithin different marsh habitats. However, with our preliminary metabolomics datawe do not have enough samples to determine whether, within a given habitat, there is a shiftin the metabolic profile of the plant-microbe association that results from nutrientenrichment. The work (proposal:https://doi.org/10.46936/10.25585/60001192) conducted by the U.S. Department of Energy Joint Genome Institute (https://ror.org/04xm1d337), a DOE Office of Science User Facility, is supported by the Office of Science of the U.S. Department of Energy operated under Contract No. DE-AC02-05CH11231.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Microbiome

SUBMITTER: Jennifer Bowen

PROVIDER: MSV000096314 | MassIVE | Wed Nov 06 09:28:00 GMT 2024

REPOSITORIES: MassIVE

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