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Marinobacter flavimaris sp. nov. and Marinobacter daepoensis sp. nov., slightly halophilic organisms isolated from sea water of the Yellow Sea in Korea

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

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

Two Gram-negative, motile, non-spore-forming and slightly halophilic rods (strains SW-145^T and SW-156^T) were isolated from sea water of the Yellow Sea in Korea. Strains SW-145^T and SW-156^T grew optimally at 37 and 30–37 °C, respectively, and in the presence of 2–6 % (w/v) NaCl. Strains SW-145^T and SW-156^T were chemotaxonomically characterized as having ubiquinone-9 as the predominant respiratory lipoquinone and C_{16 : 0}, C_{18 : 1}9c, C_{16 : 1}9c and C_{12 : 0} 3-OH as the major fatty acids. The DNA G+C contents of strains SW-145^T and SW-156^T were 58 and 57 mol%, respectively. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains SW-145^T and SW-156^T fell within the evolutionary radiation enclosed by the genus Marinobacter. The 16S rRNA gene sequences of strains SW-145^T and SW-156^T were 94·8 % similar. Strains SW-145^T and SW-156^T exhibited 16S rRNA gene sequence similarity levels of 94·3–98·1 and 95·4–97·7 %, respectively, with respect to the type strains of all Marinobacter species. Levels of DNA–DNA relatedness, together with 16S rRNA gene sequence similarity values, indicated that strains SW-145^T and SW-156^T are members of two species that are distinct from seven Marinobacter species with validly published names. On the basis of phenotypic properties and phylogenetic and genotypic distinctiveness, strains SW-145^T (=KCTC 12185^T=DSM 16070^T) and SW-156^T (=KCTC 12184^T=DSM 16072^T) should be placed in the genus Marinobacter as the type strains of two distinct novel species, for which the names Marinobacter flavimaris sp. nov. and Marinobacter daepoensis sp. nov. are proposed.

Details of the fatty acid compositions of the novel strains and related species are available as supplementary material in IJSEM Online.

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