DOI: 10.1111/gbi.12136
Scopus记录号: 2-s2.0-84926669868
论文题名: Ecologically and geologically relevant isotope signatures of C, N, and S: Okenone producing purple sulfur bacteria part I
作者: Smith D.A. ; Steele A. ; Bowden R. ; Fogel M.L.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2015
卷: 13, 期: 3 起始页码: 278
结束页码: 291
语种: 英语
Scopus关键词: autotrophy
; bacterium
; carbon cycle
; euxinic environment
; fossil assemblage
; geological record
; isotopic analysis
; isotopic fractionation
; mass extinction
; nitrogen cycle
; paleoecology
; preservation
; sulfur cycle
; Chromatiaceae
; Marichromatium purpuratum
; Thiocapsa marina
; carbon
; carotenoid
; nitrogen
; okenone
; sulfur
; biomass
; biosynthesis
; chemistry
; Chromatiaceae
; fossil
; geology
; metabolism
; Biomass
; Carbon Isotopes
; Carotenoids
; Chromatiaceae
; Fossils
; Geology
; Nitrogen Isotopes
; Sulfur Isotopes
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: Purple sulfur bacteria (PSB) are known to couple the carbon, nitrogen, and sulfur cycling in euxinic environments. This is the first study with multiple strains and species of okenone-producing PSB to examine the carbon (C), nitrogen (N), and sulfur (S) metabolisms and isotopic signatures in controlled laboratory conditions, investigating what isotopic fractionations might be recorded in modern environments and the geologic record. PSB play an integral role in the ecology of euxinic environments and produce the unique molecular fossil okenane, derived from the diagenetic alteration of the carotenoid pigment okenone. Cultures of Marichromatium purpuratum 1591 (Mpurp1591) were observed to have carbon isotope fractionations (13εbiomass - CO 2 ), via RuBisCO, ranging from -16.1 to -23.2‰ during exponential and stationary phases of growth. Cultures of Thiocapsa marina 5653 (Tmar5653) and Mpurp1591 had a nitrogen isotope fractionation (15εbiomass - NH 4 ) of -15‰, via glutamate dehydrogenase, measured and recorded for the first time in PSB. The δ34SVCDT values and amount of stored elemental sulfur for Mpurp1591 cells grown autotrophically and photoheterotrophically were dependent upon their carbon metabolic pathways. We show that PSB may contribute to the isotopic enrichments observed in modern and ancient anoxic basins. In a photoheterotrophic culture of Mpurp1591 that switched to autotrophy once the organic substrate was consumed, there were bulk biomass δ13C values that span a broader range than recorded across the Late Devonian, Permian-Triassic, Triassic-Jurassic, and OAE2 mass extinction boundaries. This finding stresses the complexities in interpreting and assigning δ13C values to bulk organic matter preserved in the geologic record. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85150
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; Geophysical Laboratory of the Carnegie Institution of Washington, Washington, DC, United States; School of Natural Sciences, University of California, Merced, Merced, CA, United States; Division of Geological and Planetary Sciences, California Institute of Technology, MC 100-23, 1200 East California Boulevard, Pasadena, CA, United States
Recommended Citation:
Smith D.A.,Steele A.,Bowden R.,et al. Ecologically and geologically relevant isotope signatures of C, N, and S: Okenone producing purple sulfur bacteria part I[J]. Geobiology,2015-01-01,13(3)