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Yan Q.-X.,Nanjing Agricultural University | Wang Y.-X.,Key Laboratory for Microbial Resources of the Ministry of Education | Wang Y.-X.,Yunnan University | Li S.-P.,Nanjing Agricultural University | And 3 more authors.
International Journal of Systematic and Evolutionary Microbiology | Year: 2010

A Gram-staining-negative, catalase-positive, carbaryl-degrading, non-spore-forming, non-motile, rod-shaped bacterium, designated strain X23 T, was isolated from a wastewater treatment system. Phylogenetic analysis based on 16S rRNA gene sequence indicated that the strain belongs to the genus Sphingobium. The highest 16S rRNA gene sequence similarity observed for the isolate was 96.6% with the type strain of Sphingobium amiense. Chemotaxonomic data [major ubiquinone: Q-10; major polar lipids: diphosphatidylglycerol, phosphatidylcholine, phosphatidylglycerol, sphingoglycolipid, phosphatidylethanolamine and unknown aminolipids and phospholipids; major fatty acids: summed feature 7 (C18 : 1ω7c, C18 : 1ω9t and/or C18 : 1ω12t), C 16 : 1ω5c, C14 : 0 2-OH and C16 : 0 2-OH] as well as the inability to reduce nitrate and the presence of spermidine as the major polyamine supported the affiliation of the strain to the genus Sphingobium. Based on the phylogenetic analysis, whole-cell fatty acid composition and biochemical characteristics, the strain could be separated from all recognized species of the genus Sphingobium. Strain X23T should be classified as a novel species of the genus Sphingobium, for which the name Sphingobium qiguonii sp. nov. is proposed, with strain X23T (=CCTCC AB 208221T =DSM 21541T) as the type strain. © 2010 IUMS.

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