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Psychrobacter aquimaris sp. nov. and Psychrobacter namhaensis sp. nov., isolated from sea water of the South Sea in Korea

¹ Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea
² The Center for Traditional Microorganism Resources, Keimyung University, Shindang-Dong, Dalseo-gu, Daegu, Korea

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

Two Gram-negative, non-motile, non-spore-forming, slightly halophilic bacterial strains, SW-210^T and SW-242^T, were isolated from sea water of the South Sea in Korea, and were characterized taxonomically by means of a polyphasic approach. The two isolates grew optimally at 25–30 °C and in the presence of 2–3 % (w/v) NaCl. Strains SW-210^T and SW-242^T contained Q-8 as the predominant respiratory lipoquinone and C_{18 : 1}9c as the major fatty acid. The DNA G+C contents of strains SW-210^T and SW-242^T were 43·2 and 45·3 mol%, respectively. The 16S rRNA gene sequences of strains SW-210^T and SW-242^T were 98·9 % similar, and the mean DNA–DNA relatedness value between them was 24 %. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains SW-210^T and SW-242^T form distinct phylogenetic lineages within the radiation of the cluster comprising Psychrobacter species, having 16S rRNA gene sequence similarity levels of 95·9–99·2 % with respect to the type strains of Psychrobacter species. The levels of DNA–DNA relatedness between the two isolates and the type strains of 15 phylogenetically related Psychrobacter species were well below 70 %. On the basis of phenotypic and phylogenetic data and genomic distinctiveness, strains SW-210^T and SW-242^T were classified in the genus Psychrobacter as representing two distinct novel species, for which the names Psychrobacter aquimaris sp. nov. (type strain, SW-210^T=KCTC 12254^T=DSM 16329^T) and Psychrobacter namhaensis sp. nov. (type strain, SW-242^T=KCTC 12255^T=DSM 16330^T) are proposed, respectively.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains SW-210^T and SW-242^T are AY722804 and AY722805, respectively.

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