title: Colwellia polaris sp. nov., a psychrotolerant bacterium isolated from Arctic sea ice.
abstract: A novel psychrotolerant, Gram-negative, aerobic bacterium, designated strain 537T, was isolated from sea-ice samples from the Arctic. Strain 537T was able to grow at 4-26 degrees C, with optimum growth occurring at 20-21 degrees C. Strain 537T had Q-8 as the major respiratory quinone and contained iso-C15:0 2-OH and/or C16:1 omega7c (22.95 %), C15:1 (17.64 %) and C17:1 omega8c (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 537T formed a coherent cluster within the genus Colwellia. The highest level of 16S rRNA gene sequence similarity (97.5 %) exhibited by strain 537T 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 537T represents a novel species of the genus Colwellia, for which the name Colwellia polaris sp. nov. is proposed. The type strain is 537T (=CGMCC 1.6132T =JCM 13952T).
authors.affiliation: China General Microbiological Culture Collection Center and State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, PR China.
authors.forename: De-Chao
authors.initials: DC
authors.lastname: Zhang
authors.forename: Yong
authors.initials: Y
authors.lastname: Yu
authors.forename: Yu-Hua
authors.initials: YH
authors.lastname: Xin
authors.forename: Hong-Can
authors.initials: HC
authors.lastname: Liu
authors.forename: Pei-Jin
authors.initials: PJ
authors.lastname: Zhou
authors.forename: Yu-Guang
authors.initials: YG
authors.lastname: Zhou
mesh_terms: D001110:Arctic Regions; D015373:Bacterial Typing Techniques; D001482:Base Composition; D003080:Cold Temperature; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D020563:Gammaproteobacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology; D020459:Genes, rRNA; D007053:Ice; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010641:Phenotype; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012623:Seawater / Q000382:microbiology*; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005227:Fatty Acids; D007053:Ice; D012336:RNA, Ribosomal, 16S