globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12173
Scopus记录号: 2-s2.0-84954156685
论文题名:
Microbial Fe(III) oxide reduction potential in Chocolate Pots hot spring, Yellowstone National Park
作者: Fortney N.W.; He S.; Converse B.J.; Beard B.L.; Johnson C.M.; Boyd E.S.; Roden E.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期:3
起始页码: 255
结束页码: 275
语种: 英语
Scopus关键词: Archean ; bacterium ; biomineralization ; genetic analysis ; geochemistry ; geothermal system ; iron oxide ; isotopic fractionation ; microbial community ; microbial mat ; oxidation ; photosynthesis ; redox conditions ; reduction ; thermal spring ; United States ; Yellowstone National Park ; Geobacter metallireducens ; bacterial RNA ; ferric ion ; ferric oxide ; RNA 16S ; bacterium ; classification ; metabolism ; microbiology ; oxidation reduction reaction ; recreational park ; thermal spring ; Wyoming ; Bacteria ; Ferric Compounds ; Hot Springs ; Oxidation-Reduction ; Parks, Recreational ; RNA, Bacterial ; RNA, Ribosomal, 16S ; Wyoming
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: Chocolate Pots hot springs (CP) is a unique, circumneutral pH, iron-rich, geothermal feature in Yellowstone National Park. Prior research at CP has focused on photosynthetically driven Fe(II) oxidation as a model for mineralization of microbial mats and deposition of Archean banded iron formations. However, geochemical and stable Fe isotopic data have suggested that dissimilatory microbial iron reduction (DIR) may be active within CP deposits. In this study, the potential for microbial reduction of native CP Fe(III) oxides was investigated, using a combination of cultivation dependent and independent approaches, to assess the potential involvement of DIR in Fe redox cycling and associated stable Fe isotope fractionation in the CP hot springs. Endogenous microbial communities were able to reduce native CP Fe(III) oxides, as documented by most probable number enumerations and enrichment culture studies. Enrichment cultures demonstrated sustained DIR driven by oxidation of acetate, lactate, and H2. Inhibitor studies and molecular analyses indicate that sulfate reduction did not contribute to observed rates of DIR in the enrichment cultures through abiotic reaction pathways. Enrichment cultures produced isotopically light Fe(II) during DIR relative to the bulk solid-phase Fe(III) oxides. Pyrosequencing of 16S rRNA genes from enrichment cultures showed dominant sequences closely affiliated with Geobacter metallireducens, a mesophilic Fe(III) oxide reducer. Shotgun metagenomic analysis of enrichment cultures confirmed the presence of a dominant G. metallireducens-like population and other less dominant populations from the phylum Ignavibacteriae, which appear to be capable of DIR. Gene (protein) searches revealed the presence of heat-shock proteins that may be involved in increased thermotolerance in the organisms present in the enrichments as well as porin-cytochrome complexes previously shown to be involved in extracellular electron transport. This analysis offers the first detailed insight into how DIR may impact the Fe geochemistry and isotope composition of a Fe-rich, circumneutral pH geothermal environment. © 2016 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/85110
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作者单位: Department of Geoscience, NASA Astrobiology Institute, University of Wisconsin-Madison, Madison, WI, United States; Department of Microbiology and Immunology, NASA Astrobiology Institute, Montana State University, Bozeman, MT, United States

Recommended Citation:
Fortney N.W.,He S.,Converse B.J.,et al. Microbial Fe(III) oxide reduction potential in Chocolate Pots hot spring, Yellowstone National Park[J]. Geobiology,2016-01-01,14(3)
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