A novel Gram-negative, catalase- and oxidase-positive, strictly aerobic, non spore-forming, rod-shaped bacterium, designated strain JSM 083058(T), was isolated from non-saline forest soil in Hunan Province, China. Growth occurred with 0-8% (w/v) NaCl (optimum, 0.5-3%) at pH 6.0-10.0 (optimum, pH 7.0) and at 5-35°C (optimum, 25-30°C). Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain JSM 083058(T) fell within the cluster comprising species of the genus Sphingomonas, clustering with Sphingomonas aestuarii K4(T), with which it shared highest 16S rRNA gene sequence similarity (99.2%). The chemotaxonomic properties of strain JSM 083058(T) were consistent with those of the genus Sphingomonas. The predominant respiratory quinone was ubiquinone Q-10, and the major cellular fatty acids were summed feature 8 (C18:1ω7c/C18:1ω6c), C16:0, summed feature 3 (C16:1ω7c/C16:1ω6c) and C17:1ω6c. The polar lipids consisted of diphosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol and sphingoglycolipid. The genomic DNA G+C content of strain JSM 083058(T) was 65.5 mol%. The combination of phylogenetic analysis, DNA-DNA relatedness, phenotypic characteristics and chemotaxonomic data supported the view that strain JSM 083058(T) represents a novel species of the genus Sphingomonas, for which the name Sphingomonas hunanensis sp. nov. is proposed. The type strain is JSM 083058(T) (=CCTCC AA 209011(T) = DSM 22213(T)).
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