气候变化领域集成服务门户(CCPortal): Laminarin is a major molecule in the marine carbon cycle

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DOI	10.1073/pnas.1917001117
	Laminarin is a major molecule in the marine carbon cycle
	Becker S.; Tebben J.; Coffinet S.; Wiltshire K.; Iversen M.H.; Harder T.; Hinrichs K.-U.; Hehemann J.-H.
发表日期	2020
ISSN	0027-8424
起始页码	6599
结束页码	6607
卷号	117 期号:12
英文摘要	Marine microalgae sequester as much CO2 into carbohydrates as terrestrial plants. Polymeric carbohydrates (i.e., glycans) provide carbon for heterotrophic organisms and constitute a carbon sink in the global oceans. The quantitative contributions of different algal glycans to cycling and sequestration of carbon remain unknown, partly because of the analytical challenge to quantify glycans in complex biological matrices. Here, we quantified a glycan structural type using a recently developed biocatalytic strategy, which involves laminarinase enzymes that specifically cleave the algal glycan laminarin into readily analyzable fragments. We measured laminarin along transects in the Arctic, Atlantic, and Pacific oceans and during three time series in the North Sea. These data revealed a median of 26 ± 17% laminarin within the particulate organic carbon pool. The observed correlation between chlorophyll and laminarin suggests an annual production of algal laminarin of 12 ± 8 gigatons: that is, approximately three times the annual atmospheric carbon dioxide increase by fossil fuel burning. Moreover, our data revealed that laminarin accounted for up to 50% of organic carbon in sinking diatom-containing particles, thus substantially contributing to carbon export from surface waters. Spatially and temporally variable laminarin concentrations in the sunlit ocean are driven by light availability. Collectively, these observations highlight the prominent ecological role and biogeochemical function of laminarin in oceanic carbon export and energy flow to higher trophic levels. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Carbon cycle; Diatoms; Diel cycle; Glycans; Laminarin
语种	英语
scopus关键词	carbon dioxide; chlorophyll; laminaran; organic carbon; surface water; carbon; carbon dioxide; chlorophyll; glucan; laminaran; sea water; air pollution; algal bloom; Arctic Ocean; Article; Atlantic Ocean; biocatalysis; carbon cycle; carbon fixation; carbon sink; degradation; diatom; food web; fossil fuel burning; light exposure; marine environment; nonhuman; North Sea; Pacific Ocean; phytoplankton; priority journal; time series analysis; trophic level; chemistry; growth, development and aging; metabolism; sea; Carbon; Carbon Cycle; Carbon Dioxide; Chlorophyll; Diatoms; Glucans; Oceans and Seas; Seawater
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159028
作者单位	Becker, S., MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, 28359, Germany, Max Planck Institute for Marine Microbiology, Bremen, 28359, Germany, Department of Geosciences, University of Bremen, Bremen, 28359, Germany; Tebben, J., Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27570, Germany; Coffinet, S., MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, 28359, Germany, Department of Geosciences, University of Bremen, Bremen, 28359, Germany; Wiltshire, K., Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27570, Germany; Iversen, M.H., MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, 28359, Germany, Department of Geosciences, University of Bremen, Bremen, 28359, Germany; Harder, T., Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27570, Germany, Faculty of Biology and Chemistry, University of Bremen, Brem...
推荐引用方式 GB/T 7714	Becker S.,Tebben J.,Coffinet S.,et al. Laminarin is a major molecule in the marine carbon cycle[J],2020,117(12).
APA	Becker S..,Tebben J..,Coffinet S..,Wiltshire K..,Iversen M.H..,...&Hehemann J.-H..(2020).Laminarin is a major molecule in the marine carbon cycle.Proceedings of the National Academy of Sciences of the United States of America,117(12).
MLA	Becker S.,et al."Laminarin is a major molecule in the marine carbon cycle".Proceedings of the National Academy of Sciences of the United States of America 117.12(2020).