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Psychrobacter celer sp. nov., isolated from sea water of the South Sea in Korea

Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, South Korea

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr

A Gram-negative, non-motile, non-spore-forming, slightly halophilic bacterial strain, SW-238^T, was isolated from sea water collected from the South Sea in Korea, and subjected to a polyphasic taxonomic study. The organism grew optimally at 25–30 °C and in the presence of 2–3 % (w/v) NaCl. Strain SW-238^T was characterized chemotaxonomically as containing ubiquinone (Q-8) as the predominant respiratory lipoquinone and C_{18 : 1}9c as the major fatty acid. Its DNA G+C content was 47·6 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain SW-238^T fell within the radiation of the cluster comprising Psychrobacter species. The 16S rRNA gene sequence of strain SW-238^T had similarity levels of 94·8–97·9 % to sequences of the type strains of recognized Psychrobacter species. Levels of DNA–DNA relatedness between strain SW-238^T and the type strains of 10 phylogenetically related Psychrobacter species were below 70 %. On the basis of phenotypic and phylogenetic data and genetic distinctiveness, strain SW-238^T (=KCTC 12313^T=JCM 12601^T) was placed in the genus Psychrobacter as the type strain of a novel species, for which the name Psychrobacter celer sp. nov. is proposed.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain SW-238^T is AY842259.

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