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Halobacterium jilantaiense sp. nov., a halophilic archaeon isolated from a saline lake in Inner Mongolia, China

¹ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, ZhongGuanCun, Haidian, Beijing 100080, PR China
² Graduate School of Chinese Academy of Sciences, Beijing 100049, China

Correspondence
Shuang-Jiang Liu
shuangjiang{at}hotmail.com

A novel halophilic archaeon, NG4^T, was isolated from Jilantai salt lake in Inner Mongolia, China. The taxonomy of strain NG4^T was studied by polyphasic methods. Strain NG4^T grew at pH 5.5–8.5 and at a temperature of 22–55 °C. It was chemo-organotrophic, aerobic and required concentrations of 2.7–5.2 M NaCl and 0.05–0.3 M Mg²⁺ for growth. Cells were Gram-negative, slender rods. Colonies on agar plates containing 25 % (w/v) total salts were red, elevated and round. According to 16S rRNA gene sequence similarity, strain NG4^T was phylogenetically related to Halobacterium salinarum DSM 3754^T (98.2 %) and Halobacterium noricense A1^T (97.3 %). The DNA G+C content was 64.2 mol%. DNA–DNA relatedness values with Hbt. salinarum DSM 3754^T and Hbt. noricense A1^T were 47 and 35 %, respectively. The polar lipids of strain NG4^T consisted of phosphatidylglycerol, methylated phosphatidylglycerol phosphate, phosphatidylglycerol sulfate, triglycosyl diether, sulfated triglycosyl diether and sulfated tetraglycosyl diether. It was concluded that strain NG4^T represents a novel species of the genus Halobacterium, for which the name Halobacterium jilantaiense sp. nov. is proposed. The type strain is NG4^T (=CGMCC 1.5337^T=JCM 13558^T).

A two-dimensional thin-layer chromatograph of polar lipids extracted from strain NG4^T is available as supplementary material in IJSEM Online.

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