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Halostagnicola larsenii gen. nov., sp. nov., an extremely halophilic archaeon from a saline lake in Inner Mongolia, China

¹ Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain
² Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
³ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, P. R. China
⁴ Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
⁵ Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
⁶ Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK

Correspondence
A. Ventosa
ventosa{at}us.es

Strain XH-48^T was isolated from the sediment of Lake Xilinhot, a saline lake in Inner Mongolia (China). The organism is pleomorphic, neutrophilic and requires at least 2.5 M (15 %) NaCl, but not MgCl₂, for growth; it exhibits optimal growth at 3.4 M (20 %) NaCl. The G+C content of its DNA is 61 mol%. 16S rRNA gene sequence analysis revealed that strain XH-48^T is a member of the family Halobacteriaceae, but there were low levels of similarity with other members of this family. The highest sequence similarity values (94.5 and 93.3 %) were obtained with the 16S rRNA genes of Natrialba aegyptiaca and Natrialba asiatica, respectively. Polar lipid analyses revealed that strain XH-48^T contains phosphatidylglycerol and phosphatidylglyceromethylphosphate, derived from both C₂₀C₂₀ and C₂₀C₂₅ glycerol diethers, and two unidentified glycolipids. On the basis of the data obtained, the novel isolate cannot be classified within any recognized genus. Strain XH-48^T should be placed within a novel genus and species within the family Halobacteriaceae, order Halobacteriales, for which the name Halostagnicola larsenii gen. nov., sp. nov. is proposed. The type strain of Halostagnicola larsenii is strain XH-48^T (=DSM 17691^T=CGMCC 1.5338^T=JCM 13463^T=CECT 7116^T).

A thin-layer chromatogram of the polar lipids of strain XH-48^T and some haloarchaea is available as a supplementary figure in IJSEM Online.

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