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Halomonas caseinilytica sp. nov., a halophilic bacterium isolated from a saline lake on the Qinghai–Tibet Plateau, China

¹ College of Life Sciences, Zhejiang University, Hangzhou 310058, PR China
² Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, PR China
³ Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, PR China
⁴ Altun Mountain National Nature Reserve Administration, Kuerle 841000, PR China

Correspondence
Min Wu
wumin{at}zju.edu.cn

A halophilic, Gram-negative bacterial strain, designated AJ261^T, which was isolated from a soil sample from a salt lake on the Qinghai–Tibet Plateau, was subjected to a polyphasic taxonomic study. The isolate grew optimally in the presence of 3–5 % NaCl and used various carbohydrates as sole carbon and energy sources. The genomic DNA G+C content was 63.0 mol%. The predominant fatty acids were C_{18 : 1}7c, C_{16 : 0} and C_{12 : 0}. A phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate had the highest sequence similarity with respect to type strains of Halomonas elongata (98.2 %), Halomonas eurihalina (98.1 %) and Halomonas halmophila (97.2 %). The DNA–DNA relatedness of strain AJ261^T with respect to H. elongata NBRC 15536^T, H. eurihalina CGMCC 1.2318^T and H. halmophila DSM 5349^T was 42, 25 and 26 %, respectively. Overall, the phenotypic, genotypic and phylogenetic results demonstrate that strain AJ261^T represents a novel species within the genus Halomonas, for which the name Halomonas caseinilytica is proposed. The type strain is AJ261^T (=CGMCC 1.6773^T =JCM 14802^T).

Micrographs of strain AJ261^T and detailed fatty acid compositions of strain AJ261^T and related type strains are available as supplementary material with the online version of this paper.