DOI: 10.1111/gbi.12172
Scopus记录号: 2-s2.0-85027940998
论文题名: Methanogens rapidly transition from methane production to iron reduction
作者: Sivan O. ; Shusta S.S. ; Valentine D.L.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期: 2 起始页码: 190
结束页码: 203
语种: 英语
Scopus关键词: 1-phenazinecarboxylic acid
; anthraquinone derivative
; anthraquinone-2,6-disulfonate
; ferrous ion
; methane
; phenazine derivative
; biogeochemistry
; concentration (composition)
; ferrihydrite
; iron
; iron oxide
; methane
; methanogenesis
; methanogenic bacterium
; organic matter
; reaction rate
; reduction
; substrate
; electron transport
; metabolism
; Methanosarcina barkeri
; microbiology
; oxidation reduction reaction
; sediment
; Anthraquinones
; Electron Transport
; Ferrous Compounds
; Geologic Sediments
; Methane
; Methanosarcina barkeri
; Oxidation-Reduction
; Phenazines
; Methanosarcina barkeri
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: Methanogenesis, the microbial methane (CH4 ) production, is traditionally thought to anchor the mineralization of organic matter as the ultimate respiratory process in deep sediments, despite the presence of oxidized mineral phases, such as iron oxides. This process is carried out by archaea that have also been shown to be capable of reducing iron in high levels of electron donors such as hydrogen. The current pure culture study demonstrates that methanogenic archaea (Methanosarcina barkeri) rapidly switch from methanogenesis to iron-oxide reduction close to natural conditions, with nitrogen atmosphere, even when faced with substrate limitations. Intensive, biotic iron reduction was observed following the addition of poorly crystalline ferrihydrite and complex organic matter and was accompanied by inhibition of methane production. The reaction rate of this process was of the first order and was dependent only on the initial iron concentrations. Ferrous iron production did not accelerate significantly with the addition of 9,10-anthraquinone-2,6-disulfonate (AQDS) but increased by 11-28% with the addition of phenazine-1-carboxylate (PCA), suggesting the possible role of methanophenazines in the electron transport. The coupling between ferrous iron and methane production has important global implications. The rapid transition from methanogenesis to reduction of iron-oxides close to the natural conditions in sediments may help to explain the globally-distributed phenomena of increasing ferrous concentrations below the traditional iron reduction zone in the deep 'methanogenic' sediment horizon, with implications for metabolic networking in these subsurface ecosystems and in past geological settings. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85115
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Geological and Environmental Sciences, Ben Gurion University of the Negev, Beer-Sheva, Israel; Department of Earth Science and Marine Science Institute, University of California, Santa Barbara, CA, USA
Recommended Citation:
Sivan O.,Shusta S.S.,Valentine D.L.. Methanogens rapidly transition from methane production to iron reduction[J]. Geobiology,2016-01-01,14(2)