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Study on humic substances degradation by a microbial consortium from subarctic tundra soil

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Title
Study on humic substances degradation by a microbial consortium from subarctic tundra soil
Other Titles
북극 툰드라 토양 미생물 컨소시엄에 의한 부식질 분해경로 연구
Authors
Kim, Dockyu
Park, Ha Ju
Nam, Sungjin
Kim, Seok Cheol
Lee, Chang Woo
Keywords
degradation pathway; humic substances; microbial consortium; tundra soil
Issue Date
2019
Citation
Kim, Dockyu, et al. 2019. Study on humic substances degradation by a microbial consortium from subarctic tundra soil. 2019 Microbial Ecological Diversity Workshop. Anmyeondo Resom Ocean Castle Resort. 2019.08.26~2019.08.28.
Abstract
The largest constituent of soil organic matter, humic substances (HS), is naturally present as aromatic heteropolymers, with a composition similar to lignin. The microbes in a sample of subarctic tundra soil (Alaska, USA) were able to degrade humic acids (HA, a major component of HS) during microcosm experiments at a low temperature of 5℃, which is similar to natural soil temperature during the thawing period (average temperature of 5.6℃ at a depth of 20 cm). The relative abundance of HA decreased to approximately 71% compared with the non-incubated soil control (100%). The microbes, however, were unable to degrade HA at 25℃, which is in the ideal soil temperature range for planting most plants. When enriched at 15℃ in liquid mineral medium provided with HA as a sole carbon source, the HA-enriched microbial consortium was metabolically activated to degrade abundant soil carbons (e.g., 4-hydroxy benzoic acid and D-cellobiose) and completely degraded 2-methoxy phenols (ferulic and vanillic acids), which are lignin-derived mono-aromatics. Our data indicate that the microbial consortium of Alaska tundra soil, which dominantly contains phylum Proteobacteria (specifically, class Betaproteobacteria), is cold-adapted and symbiotically degrades HS, possibly via a bacterial lignin-catabolic pathway in which vanillic acid is a main metabolite. To our knowledge, this is the first report describing a HS-degradative pathway at the microbial consortium level.
URI
https://repository.kopri.re.kr/handle/201206/12277
Conference Name
2019 Microbial Ecological Diversity Workshop
Conference Place
Anmyeondo Resom Ocean Castle Resort
Conference Date
2019.08.26~2019.08.28
Appears in Collections  
2019-2019, Modeling responses of terrestrial organisms to environmental changes on King George Island (19-19) / Lee, Hyoungseok (PE19090)
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