1887

Abstract

Two Gram-negative, non-motile, non-spore-forming, slightly halophilic bacterial strains, SW-210 and SW-242, 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 and SW-242 contained Q-8 as the predominant respiratory lipoquinone and C 9 as the major fatty acid. The DNA G+C contents of strains SW-210 and SW-242 were 43·2 and 45·3 mol%, respectively. The 16S rRNA gene sequences of strains SW-210 and SW-242 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 and SW-242 form distinct phylogenetic lineages within the radiation of the cluster comprising species, having 16S rRNA gene sequence similarity levels of 95·9–99·2 % with respect to the type strains of species. The levels of DNA–DNA relatedness between the two isolates and the type strains of 15 phylogenetically related species were well below 70 %. On the basis of phenotypic and phylogenetic data and genomic distinctiveness, strains SW-210 and SW-242 were classified in the genus as representing two distinct novel species, for which the names sp. nov. (type strain, SW-210=KCTC 12254=DSM 16329) and sp. nov. (type strain, SW-242=KCTC 12255=DSM 16330) are proposed, respectively.

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2005-05-01
2020-09-28
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