期刊
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
卷 84, 期 9, 页码 -出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.02816-17
关键词
fungal peroxidase; fungi; peroxidase; atmospheric N deposition; peroxidases; soil carbon
资金
- United States Department of Energy Office of Science Biological and Environmental Research Program [DE-SC0010541]
- National Science Foundation Long-term Research in Environmental Biology program [DEB 1252841]
- NSF [OCE-1540158]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- Division Of Environmental Biology [1251529] Funding Source: National Science Foundation
Here, we present evidence that ca. 20 years of experimental N deposition altered the composition of lignin-decaying class II peroxidases expressed by forest floor fungi, a response which has occurred concurrently with reductions in plant litter decomposition and a rapid accumulation of soil organic matter. This finding suggests that anthropogenic N deposition has induced changes in the biological mediation of lignin decay, the rate limiting step in plant litter decomposition. Thus, an altered composition of transcripts for a critical gene that is associated with terrestrial C cycling may explain the increased soil C storage under long-term increases in anthropogenic N deposition. IMPORTANCE Fungal class II peroxidases are enzymes that mediate the rate-limiting step in the decomposition of plant material, which involves the oxidation of lignin and other polyphenols. In field experiments, anthropogenic N deposition has increased soil C storage in forests, a result which could potentially arise from anthropogenic N-induced changes in the composition of class II peroxidases expressed by the fungal community. In this study, we have gained unique insight into how anthropogenic N deposition, a widespread agent of global change, affects the expression of a functional gene encoding an enzyme that plays a critical role in a biologically mediated ecosystem process.
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