Tepidicella baoligensis sp. nov., A Novel Member of Betaproteobacterium Isolated from an Oil Reservoir

Abstract

A Gram-negative, non-pigmented, aerobic bacterium, designated strain B18-50^T was isolated from oil-well production water in Baolige oilfield, China. The strain was able to grow at pH 6.5–10.5 (optimum at pH 7.5–8.5), in 0–3% (w/v) NaCl (optimum at 0–0.5%, w/v) and at 20–60 °C (optimum at 45 °C). Cells of the isolate were motile with a single polar flagellum and non-spore-forming rods. Organic acids and amino acids were used as carbon and energy sources, but sugars and polyols were not assimilated. The major cellular fatty acids were C_16:0, C_16:1ω6c/ω7c, and C_18:1ω7c. Ubiquinone 8 was the predominant respiratory quinone. The major polar lipids consisted of phosphatidylethanolamine, phosphatidylglycerol, and diphosphatidylglycerol. The genomic DNA G+C content of the isolate was 62.8 mol%. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain B18-50^T was most closely related to Tepidicella xavieri DSM 19605^T (97.5% similarity). Comparative analysis of genotypic and phenotypic features indicate that strain B18-50^T represents a novel species of the genus Tepidicella, for which the name Tepidicella baoligensis sp. nov. is proposed. The type strain is B18-50^T (= CGMCC 1.13575^T = KCTC 62779^T).

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