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Colwellia polaris sp. nov., a psychrotolerant bacterium isolated from Arctic sea ice

¹ China General Microbiological Culture Collection Center and State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
² SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, PR China

Correspondence
Yu-Guang Zhou
zhouyg{at}sun.im.ac.cn

A novel psychrotolerant, Gram-negative, aerobic bacterium, designated strain 537^T, was isolated from sea-ice samples from the Arctic. Strain 537^T was able to grow at 4–26 °C, with optimum growth occurring at 20–21 °C. Strain 537^T had Q-8 as the major respiratory quinone and contained iso-C_{15 : 0} 2-OH and/or C_{16 : 1}7c (22.95 %), C_{15 : 1} (17.64 %) and C_{17 : 1}8c (13.74 %) as the predominant cellular fatty acids. The genomic DNA G+C content was 38.9 mol%. A phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 537^T formed a coherent cluster within the genus Colwellia. The highest level of 16S rRNA gene sequence similarity (97.5 %) exhibited by strain 537^T was obtained with respect to the type strain of Colwellia aestuarii. On the basis of phenotypic, chemotaxonomic and phylogenetic properties and DNA–DNA relatedness data, strain 537^T represents a novel species of the genus Colwellia, for which the name Colwellia polaris sp. nov. is proposed. The type strain is 537^T (=CGMCC 1.6132^T =JCM 13952^T).

Cellular fatty acid compositions of strain 537^T and Colwellia species are presented in a supplementary table available with the online version of this paper.