期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 23, 页码 6022-6027出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1718854115
关键词
lignin degradation; Bathyarchaeota; sedimentary carbon cycling; lipid; carbon fixation
资金
- State Key Research and Development Project of China [2016YFA0601102]
- Natural Science Foundation of China [41525011, 91751205, 91428308]
- Deutsche Forschungsgemeinschaft through the Gottfried Wilhelm Leibniz Program Award [Hi 616-14-1]
Members of the archaeal phylum Bathyarchaeota are among the most abundant microorganisms on Earth. Although versatile metabolic capabilities such as acetogenesis, methanogenesis, and fermentation have been suggested for bathyarchaeotal members, no direct confirmation of these metabolic functions has been achieved through growth of Bathyarchaeota in the laboratory. Here we demonstrate, on the basis of gene-copy numbers and probing of archaeal lipids, the growth of Bathyarchaeota subgroup Bathy-8 in enrichments of estuarine sediments with the biopolymer lignin. Other organic substrates (casein, oleic acid, cellulose, and phenol) did not significantly stimulate growth of Bathyarchaeota. Meanwhile, putative bathyarchaeotal tetraether lipids incorporated C-13 from C-13-bicarbonate only when added in concert with lignin. Our results are consistent with organoautotrophic growth of a bathyarchaeotal group with lignin as an energy source and bicarbonate as a carbon source and shed light into the cycling of one of Earth's most abundant biopolymers in anoxic marine sediment.
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