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Psychroflexus sediminis sp. nov., a mesophilic bacterium isolated from salt lake sediment in China

¹ Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan 650091, PR China
² College of Bio-Resources and Environmental Science, Jishou University, Jishou, Hunan 416000, PR China
³ Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, PR China
⁴ Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China

Correspondence
Xiao-Long Cui
xlcuiynu{at}yahoo.com.cn
or
xlcui{at}ynu.edu.cn

A novel Gram-negative, mesophilic, slightly halophilic, catalase- and oxidase-positive, obligately aerobic bacterium, designated strain YIM-C238^T, was isolated from a sediment sample from a salt lake in the Qaidam Basin, north-west China. Cells were non-sporulating, non-motile, straight to slightly curved rods. Coccoid bodies and filaments of varying length developed in older cultures. Growth occurred with 0.5–6 % (w/v) NaCl [optimum, 2–3 % (w/v) NaCl], at pH 6.0–10.0 (optimum, pH 7.0–8.0) and at 10–40 °C (optimum, 25–30 °C). The major cellular fatty acids were anteiso-C_{15 : 0}, 3-OH iso-C_{16 : 0} and anteiso-C_{15 : 1}10c, and menaquinone 6 was the sole respiratory quinone. Non-diffusible carotenoid pigments were produced. Flexirubin pigments were absent. The genomic DNA G+C content was 35.8 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain YIM-C238^T should be assigned to the genus Psychroflexus. The sequence similarities between the isolate and the type strains of members of the genus Psychroflexus were in the range 95.5–97.0 %. The combination of phylogenetic analysis, DNA–DNA hybridization data, phenotypic characteristics and chemotaxonomic differences supported the view that strain YIM-C238^T represents a novel species of the genus Psychroflexus, for which the name Psychroflexus sediminis sp. nov. is proposed. The type strain is YIM-C238^T (=CCTCC AA 207030^T=KCTC 22166^T).

A table showing the fatty acid compositions of strain YIM-C238^T and other Psychroflexus species is available as supplementary material with the online version of this paper.

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