文献类型： 外文期刊
作者： Su, Tongfu 1 ; Liu, Haohao 2 ; Zhang, Chaohui 3 ; Shang, Di 2 ; Wang, Chaojiang 4 ; Qiu, Liyou 2 ;
作者机构： 1.Henan Agr Univ, Coll Sci, Zhengzhou, Peoples R China
2.Henan Agr Univ, Coll Life Sci, Key Lab Enzyme Engn Agr Microbiol, Minist Agr & Rural Affairs, Zhengzhou, Peoples R China
3.Henan Inst Sci & Technol, Coll Life Sci & Technol, Xinxiang, Henan, Peoples R China
4.Hebei Acad Agr & Forestry Sci, Inst Genet & Physiol, Shijiazhuang, Hebei, Peoples R China
关键词： microbial mats; extracellular polymeric substances; chemical composition; spectra analysis; microbial community structure; Taisui
期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.64； 五年影响因子：6.32 ）
ISSN： 1664-302X
年卷期： 2020 年 11 卷
页码：
收录情况： SCI
摘要： In this study, Taisui TS-2007S, a previously unidentified biological object discovered in soil in China, was identified. TS-2007S was shown to contain abundant carbohydrates but a scarcity of protein, fat, and minerals. The exopolymers of TS-2007S showed FT-IR spectra that were similar to those of xanthan gum (XG) but that were dissimilar to those of polyvinyl alcohol (PVA). The NMR spectra of TS-2007S exopolymers in D2O were similar to those of PVA but differed from those of xanthan gum. Unlike PVA, TS-2007S exopolymers and xanthan gum were not soluble in dimethyl sulfoxide (DMSO). Furthermore, the exopolymers contained many monosaccharide components, including fucose, rhamnose, mannose, and glucuronic acid in a molar ratio of 87.90:7.49:4.45:0.15. The exopolymers also included traces of glucuronic acid, galactose, and xylose. Taken together, these results suggest that the exopolymers are microbial extracellular polymeric substances (EPSs). The microbial community structure in TS-2007S showed that the predominant bacterial, archaeal, and fungal phyla were Proteobacteria, Euryarchaeota, and Ascomycota at high relative abundances of 90.77, 97.15, and 87.43%, respectively, different from those observed in water and soil environments. Based on these results, we strongly propose that TS-2007S should be defined as a microbial mat formed in soil.
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