Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria.
BACKGROUND: In a warmer world, microbial decomposition of previously frozen organic carbon (C) is one of the most likely positive climate feedbacks of permafrost regions to the atmosphere. However, mechanistic understanding of microbial mediation on chemically recalcitrant C instability is limited;...
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ftcdlib:oai:escholarship.org:ark:/13030/qt5sb025qb 2024-04-28T08:11:19+00:00 Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria. Tao, Xuanyu Feng, Jiajie Yang, Yunfeng Wang, Gangsheng Tian, Renmao Fan, Fenliang Ning, Daliang Bates, Colin Hale, Lauren Yuan, Mengting Wu, Linwei Gao, Qun Lei, Jiesi Schuur, Edward Yu, Julian Bracho, Rosvel Luo, Yiqi Konstantinidis, Konstantinos Johnston, Eric Cole, James Penton, C Tiedje, James Zhou, Jizhong 2020-06-05 application/pdf https://escholarship.org/uc/item/5sb025qb unknown eScholarship, University of California qt5sb025qb https://escholarship.org/uc/item/5sb025qb public Microbiome, vol 8, iss 1 Alaska Burkholderia Climate Change Hot Temperature Lignin Permafrost Proteobacteria Soil Soil Microbiology Tundra article 2020 ftcdlib 2024-04-09T23:35:52Z BACKGROUND: In a warmer world, microbial decomposition of previously frozen organic carbon (C) is one of the most likely positive climate feedbacks of permafrost regions to the atmosphere. However, mechanistic understanding of microbial mediation on chemically recalcitrant C instability is limited; thus, it is crucial to identify and evaluate active decomposers of chemically recalcitrant C, which is essential for predicting C-cycle feedbacks and their relative strength of influence on climate change. Using stable isotope probing of the active layer of Arctic tundra soils after depleting soil labile C through a 975-day laboratory incubation, the identity of microbial decomposers of lignin and, their responses to warming were revealed. RESULTS: The β-Proteobacteria genus Burkholderia accounted for 95.1% of total abundance of potential lignin decomposers. Consistently, Burkholderia isolated from our tundra soils could grow with lignin as the sole C source. A 2.2 °C increase of warming considerably increased total abundance and functional capacities of all potential lignin decomposers. In addition to Burkholderia, α-Proteobacteria capable of lignin decomposition (e.g. Bradyrhizobium and Methylobacterium genera) were stimulated by warming by 82-fold. Those community changes collectively doubled the priming effect, i.e., decomposition of existing C after fresh C input to soil. Consequently, warming aggravates soil C instability, as verified by microbially enabled climate-C modeling. CONCLUSIONS: Our findings are alarming, which demonstrate that accelerated C decomposition under warming conditions will make tundra soils a larger biospheric C source than anticipated. Video Abstract. Article in Journal/Newspaper Arctic Climate change permafrost Tundra Alaska University of California: eScholarship |
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Open Polar |
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University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Alaska Burkholderia Climate Change Hot Temperature Lignin Permafrost Proteobacteria Soil Soil Microbiology Tundra |
spellingShingle |
Alaska Burkholderia Climate Change Hot Temperature Lignin Permafrost Proteobacteria Soil Soil Microbiology Tundra Tao, Xuanyu Feng, Jiajie Yang, Yunfeng Wang, Gangsheng Tian, Renmao Fan, Fenliang Ning, Daliang Bates, Colin Hale, Lauren Yuan, Mengting Wu, Linwei Gao, Qun Lei, Jiesi Schuur, Edward Yu, Julian Bracho, Rosvel Luo, Yiqi Konstantinidis, Konstantinos Johnston, Eric Cole, James Penton, C Tiedje, James Zhou, Jizhong Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria. |
topic_facet |
Alaska Burkholderia Climate Change Hot Temperature Lignin Permafrost Proteobacteria Soil Soil Microbiology Tundra |
description |
BACKGROUND: In a warmer world, microbial decomposition of previously frozen organic carbon (C) is one of the most likely positive climate feedbacks of permafrost regions to the atmosphere. However, mechanistic understanding of microbial mediation on chemically recalcitrant C instability is limited; thus, it is crucial to identify and evaluate active decomposers of chemically recalcitrant C, which is essential for predicting C-cycle feedbacks and their relative strength of influence on climate change. Using stable isotope probing of the active layer of Arctic tundra soils after depleting soil labile C through a 975-day laboratory incubation, the identity of microbial decomposers of lignin and, their responses to warming were revealed. RESULTS: The β-Proteobacteria genus Burkholderia accounted for 95.1% of total abundance of potential lignin decomposers. Consistently, Burkholderia isolated from our tundra soils could grow with lignin as the sole C source. A 2.2 °C increase of warming considerably increased total abundance and functional capacities of all potential lignin decomposers. In addition to Burkholderia, α-Proteobacteria capable of lignin decomposition (e.g. Bradyrhizobium and Methylobacterium genera) were stimulated by warming by 82-fold. Those community changes collectively doubled the priming effect, i.e., decomposition of existing C after fresh C input to soil. Consequently, warming aggravates soil C instability, as verified by microbially enabled climate-C modeling. CONCLUSIONS: Our findings are alarming, which demonstrate that accelerated C decomposition under warming conditions will make tundra soils a larger biospheric C source than anticipated. Video Abstract. |
format |
Article in Journal/Newspaper |
author |
Tao, Xuanyu Feng, Jiajie Yang, Yunfeng Wang, Gangsheng Tian, Renmao Fan, Fenliang Ning, Daliang Bates, Colin Hale, Lauren Yuan, Mengting Wu, Linwei Gao, Qun Lei, Jiesi Schuur, Edward Yu, Julian Bracho, Rosvel Luo, Yiqi Konstantinidis, Konstantinos Johnston, Eric Cole, James Penton, C Tiedje, James Zhou, Jizhong |
author_facet |
Tao, Xuanyu Feng, Jiajie Yang, Yunfeng Wang, Gangsheng Tian, Renmao Fan, Fenliang Ning, Daliang Bates, Colin Hale, Lauren Yuan, Mengting Wu, Linwei Gao, Qun Lei, Jiesi Schuur, Edward Yu, Julian Bracho, Rosvel Luo, Yiqi Konstantinidis, Konstantinos Johnston, Eric Cole, James Penton, C Tiedje, James Zhou, Jizhong |
author_sort |
Tao, Xuanyu |
title |
Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria. |
title_short |
Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria. |
title_full |
Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria. |
title_fullStr |
Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria. |
title_full_unstemmed |
Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria. |
title_sort |
winter warming in alaska accelerates lignin decomposition contributed by proteobacteria. |
publisher |
eScholarship, University of California |
publishDate |
2020 |
url |
https://escholarship.org/uc/item/5sb025qb |
genre |
Arctic Climate change permafrost Tundra Alaska |
genre_facet |
Arctic Climate change permafrost Tundra Alaska |
op_source |
Microbiome, vol 8, iss 1 |
op_relation |
qt5sb025qb https://escholarship.org/uc/item/5sb025qb |
op_rights |
public |
_version_ |
1797578794541776896 |