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Halorubrum luteum sp. nov., isolated from Lake Chagannor, Inner Mongolia, China

¹ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
² Graduate School of the Chinese Academy of Sciences, Beijing 100049, PR China
³ Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
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
Yanfen Xue
xueyf{at}im.ac.cn

A novel halophilic archaeon, strain CGSA15^T, was isolated from water of Lake Chagannor in China. The strain grew optimally at 33–37 °C, pH 9.5–10.0 and 4.0–4.3 M NaCl. The major polar lipids were phosphatidylglycerol and phosphatidylglycerol phosphate methyl ester. The genomic DNA G+C content of strain CGSA15^T was 60.2 mol%. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CGSA15^T was a member of the genus Halorubrum and was related most closely to Halorubrum alkaliphilum AS 1.3528^T (96.1 % similarity) and Halorubrum tibetense AS 1.3239^T (96.9 %). Levels of DNA–DNA relatedness between strain CGSA15^T and Hrr. alkaliphilum AS 1.3528^T and Hrr. tibetense AS 1.3239^T were 36.7 and 28.9 %, respectively. According to the phenotypic and genotypic data presented, strain CGSA15^T is considered to represent a novel species of the genus Halorubrum, for which the name Halorubrum luteum sp. nov. is proposed. The type strain is CGSA15^T (=CGMCC 1.6783^T =CECT 7303^T).

Micrographs of cells of strain CGSA15^T and figure showing the polar lipid pattern of strain CGSA15^T are available as supplementary material with the online version of this paper.