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Differences in substrate use linked to divergent carbon flow during litter decomposition

Journal Article · · FEMS Microbiology Ecology (Online)
 [1];  [2];  [1];  [1];  [1];  [1];  [3];  [1]
  1. Biosciences Division, Los Alamos National Laboratory, Mailstop M888, Los Alamos, NM 87545, USA
  2. Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO 80523, USA
  3. Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO 80523, USA, School of Biomedical Engineering, Colorado State University, Fort Collins, CO 80523, USA
ABSTRACT

Discovering widespread microbial processes that create variation in soil carbon (C) cycling within ecosystems may improve soil C modeling. Toward this end, we screened 206 soil communities decomposing plant litter in a common garden microcosm environment and examined features linked to divergent patterns of C flow. C flow was measured as carbon dioxide (CO2) and dissolved organic carbon (DOC) from 44-days of litter decomposition. Two large groups of microbial communities representing ‘high’ and ‘low’ DOC phenotypes from original soil and 44-day microcosm samples were down-selected for fungal and bacterial profiling. Metatranscriptomes were also sequenced from a smaller subset of communities in each group. The two groups exhibited differences in average rate of CO2 production, demonstrating that the divergent patterns of C flow arose from innate functional constraints on C metabolism, not a time-dependent artefact. To infer functional constraints, we identified features – traits at the organism, pathway or gene level – linked to the high and low DOC phenotypes using RNA-Seq approaches and machine learning approaches. Substrate use differed across the high and low DOC phenotypes. Additional features suggested that divergent patterns of C flow may be driven in part by differences in organism interactions that affect DOC abundance directly or indirectly by controlling community structure.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Biological and Environmental Research (BER)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1641872
Alternate ID(s):
OSTI ID: 1716813
Report Number(s):
LA-UR--20-22813; fiaa135
Journal Information:
FEMS Microbiology Ecology (Online), Journal Name: FEMS Microbiology Ecology (Online) Journal Issue: 8 Vol. 96; ISSN 1574-6941
Publisher:
Federation of European Microbiological SocietiesCopyright Statement
Country of Publication:
Netherlands
Language:
English

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