DOI: 10.1111/gbi.12241
Scopus记录号: 2-s2.0-85018972577
论文题名: Microbial acceleration of aerobic pyrite oxidation at circumneutral pH
作者: Percak-Dennett E. ; He S. ; Converse B. ; Konishi H. ; Xu H. ; Corcoran A. ; Noguera D. ; Chan C. ; Bhattacharyya A. ; Borch T. ; Boyd E. ; Roden E.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期: 5 起始页码: 690
结束页码: 703
语种: 英语
英文关键词: chemolithotrophic
; circumneutral
; microbial
; oxidation
; pyrite
Scopus关键词: acid mine drainage
; amorphous medium
; biogeochemistry
; genome
; iron oxide
; microbial activity
; microorganism
; mobility
; oxic conditions
; oxidation
; partitioning
; pH
; pyrite
; reconstruction
; sediment chemistry
; surficial sediment
; Bradyrhizobium sp.
; Mesorhizobium
; Ralstonia
; Rhizobiales
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: Pyrite (FeS2) is the most abundant sulfide mineral on Earth and represents a significant reservoir of reduced iron and sulfur both today and in the geologic past. In modern environments, oxidative transformations of pyrite and other metal sulfides play a key role in terrestrial element partitioning with broad impacts to contaminant mobility and the formation of acid mine drainage systems. Although the role of aerobic micro-organisms in pyrite oxidation under acidic-pH conditions is well known, to date there is very little known about the capacity for aerobic micro-organisms to oxidize pyrite at circumneutral pH. Here, we describe two enrichment cultures, obtained from pyrite-bearing subsurface sediments, that were capable of sustained cell growth linked to pyrite oxidation and sulfate generation at neutral pH. The cultures were dominated by two Rhizobiales species (Bradyrhizobium sp. and Mesorhizobium sp.) and a Ralstonia species. Shotgun metagenomic sequencing and genome reconstruction indicated the presence of Fe and S oxidation pathways in these organisms, and the presence of a complete Calvin–Benson–Bassham CO2 fixation system in the Bradyrhizobium sp. Oxidation of pyrite resulted in thin (30–50 nm) coatings of amorphous Fe(III) oxide on the pyrite surface, with no other secondary Fe or S phases detected by electron microscopy or X-ray absorption spectroscopy. Rates of microbial pyrite oxidation were approximately one order of magnitude higher than abiotic rates. These results demonstrate the ability of aerobic microbial activity to accelerate pyrite oxidation and expand the potential contribution of micro-organisms to continental sulfide mineral weathering around the time of the Great Oxidation Event to include neutral-pH environments. In addition, our findings have direct implications for the geochemistry of modern sedimentary environments, including stimulation of the early stages of acid mine drainage formation and mobilization of pyrite-associated metals. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85041
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Geoscience, NASA Astrobiology Institute, University of Wisconsin-Madison, Madison, WI, United States; Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI, United States; Department of Geological Sciences, University of Delaware, Newark, DE, United States; Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO, United States; Department of Microbiology & Immunology, Montana State University, Bozeman, MT, United States
Recommended Citation:
Percak-Dennett E.,He S.,Converse B.,et al. Microbial acceleration of aerobic pyrite oxidation at circumneutral pH[J]. Geobiology,2017-01-01,15(5)