globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12092
Scopus记录号: 2-s2.0-84906085977
论文题名:
Coupled reductive and oxidative sulfur cycling in the phototrophic plate of a meromictic lake
作者: Hamilton T.L.; Bovee R.J.; Thiel V.; Sattin S.R.; Mohr W.; Schaperdoth I.; Vogl K.; Gilhooly W.P.; Lyons T.W.; Tomsho L.P.; Schuster S.C.; Overmann J.; Bryant D.A.; Pearson A.; Macalady J.L.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2014
卷: 12, 期:5
起始页码: 451
结束页码: 468
语种: 英语
Scopus关键词: anoxic conditions ; bacterioplankton ; bacterium ; benthos ; carbon cycle ; cline ; heterotrophy ; meromictic lake ; oxidation ; photic zone ; photoautotrophy ; primary production ; reduction ; sulfur cycle ; British Columbia ; Canada ; Mahoney Lake ; Bacteria (microorganisms) ; Chromatiaceae ; Thiohalocapsa ; sulfur ; bacterial genome ; Canada ; Chromatiaceae ; DNA sequence ; genetics ; lake ; metabolism ; microbiology ; molecular genetics ; oxidation reduction reaction ; phylogeography ; British Columbia ; Chromatiaceae ; Genome, Bacterial ; Lakes ; Molecular Sequence Data ; Oxidation-Reduction ; Phylogeography ; Sequence Analysis, DNA ; Sulfur
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Mahoney Lake represents an extreme meromictic model system and is a valuable site for examining the organisms and processes that sustain photic zone euxinia (PZE). A single population of purple sulfur bacteria (PSB) living in a dense phototrophic plate in the chemocline is responsible for most of the primary production in Mahoney Lake. Here, we present metagenomic data from this phototrophic plate - including the genome of the major PSB, as obtained from both a highly enriched culture and from the metagenomic data - as well as evidence for multiple other taxa that contribute to the oxidative sulfur cycle and to sulfate reduction. The planktonic PSB is a member of the Chromatiaceae, here renamed Thiohalocapsa sp. strain ML1. It produces the carotenoid okenone, yet its closest relatives are benthic PSB isolates, a finding that may complicate the use of okenone (okenane) as a biomarker for ancient PZE. Favorable thermodynamics for non-phototrophic sulfide oxidation and sulfate reduction reactions also occur in the plate, and a suite of organisms capable of oxidizing and reducing sulfur is apparent in the metagenome. Fluctuating supplies of both reduced carbon and reduced sulfur to the chemocline may partly account for the diversity of both autotrophic and heterotrophic species. Collectively, the data demonstrate the physiological potential for maintaining complex sulfur and carbon cycles in an anoxic water column, driven by the input of exogenous organic matter. This is consistent with suggestions that high levels of oxygenic primary production maintain episodes of PZE in Earth's history and that such communities should support a diversity of sulfur cycle reactions. © 2014 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85181
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Geosciences, Penn State Astrobiology Research Center (PSARC), The Pennsylvania State University, University Park, PA, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, United States; Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN, United States; Department of Earth Sciences, University of California, Riverside, CA, United States; Singapore Center for Environmental Life Sciences Engineering, Nanyang Technological University, Nanyang, Singapore; Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen, Braunschweig, Germany; Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT, United States

Recommended Citation:
Hamilton T.L.,Bovee R.J.,Thiel V.,et al. Coupled reductive and oxidative sulfur cycling in the phototrophic plate of a meromictic lake[J]. Geobiology,2014-01-01,12(5)
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