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Halobacillus dabanensis sp. nov. and Halobacillus aidingensis sp. nov., isolated from salt lakes in Xinjiang, China

¹ Department of Microbiology, College of Biological Sciences, China Agricultural University, Key Laboratory for Agro-Microbial Resource and Application, Ministry of Agriculture, Beijing, 100094, P. R. China
² Division of Mineral Resources, Metallurgy and Materials, General Research Institute for Nonferrous Metals, Beijing, 100088, P. R. China

Correspondence
S. S. Yang
yangssh{at}cau.edu.cn

Two moderately halophilic spore-forming bacteria were isolated from salt lakes in the Xinjiang region of China. The two strains, designated AD-6^T and D-8^T, were aerobic, Gram-positive, rod-shaped and motile by means of peritrichous flagella. Strains AD-6^T and D-8^T grew in the presence of 0·5–20 % and 0·5–25 % (w/v) NaCl in complex medium, respectively. Their cell-wall peptidoglycan was of the L-orn–D-Asp type. The major menaquinone found in both strains was menaquinone-7 (MK-7). The fatty acid profile contained a large amount of branched fatty acids; the main fatty acids were anteiso-C_{15 : 0}, anteiso-C_{17 : 0}, iso-C_{15 : 0} and iso-C_{16 : 0}. The DNA G+C content of strains D-8^T and AD-6^T was 41·4 and 42·2 mol%, respectively. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strains D-8^T and AD-6^T were located in the genus Halobacillus. Levels of 16S rRNA gene sequence similarity between the isolated strains and the type strains of Halobacillus species were in the range 96·2–99·5 %. DNA–DNA relatedness values of 17·0–52·2 % were found between the two strains and other Halobacillus species. The DNA–DNA relatedness value between D-8^T and AD-6^T was 50·6 %. On the basis of phenotypic and chemotaxonomic properties, phylogenetic analysis and genomic distinctiveness, strains D-8^T and AD-6^T should be placed in the genus Halobacillus as two novel species, for which the names Halobacillus dabanensis sp. nov. (type strain=JCM 12772^T=CGMCC 1.3704^T) and Halobacillus aidingensis sp. nov. (type strain=JCM 12771^T=CGMCC 1.3703^T) are proposed, respectively.

The GenBank/EMBL/DDBJ accession numbers for the almost-complete 16S rRNA gene sequences of strains D-8^T and AD-6^T are AY351395 and AY351389, respectively.

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