期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms9289
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资金
- Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory
- US Department of Energy Office of Science
- US Department of Energy Office of Science, Office of Biological and Environmental Research Early Career Program [DE-AC02-05CH11231]
- ENIGMA-Ecosystems and Networks Integrated with Genes and Molecular Assemblies SFA
- Office of Science, Office of Biological and Environmental Research, US Department of Energy [DE-AC02-05CH11231]
Soils are arguably the most microbially diverse ecosystems. Physicochemical properties have been associated with the maintenance of this diversity. Yet, the role of microbial substrate specialization is largely unexplored since substrate utilization studies have focused on simple substrates, not the complex mixtures representative of the soil environment. Here we examine the exometabolite composition of desert biological soil crusts (biocrusts) and the substrate preferences of seven biocrust isolates. The biocrust's main primary producer releases a diverse array of metabolites, and isolates of physically associated taxa use unique subsets of the complex metabolite pool. Individual isolates use only 13-26% of available metabolites, with only 2 out of 470 used by all and 40% not used by any. An extension of this approach to a mesophilic soil environment also reveals high levels of microbial substrate specialization. These results suggest that exometabolite niche partitioning may be an important factor in the maintenance of microbial diversity.
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