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Marinomonas dokdonensis sp. nov., isolated from sea water

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

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr
Tae-Kwang Oh
otk{at}kribb.re.kr

Two Gram-negative, motile, non-spore-forming, slightly halophilic bacteria (strains DSW10-10^T and DSW10-19) were isolated from sea water and subjected to a polyphasic taxonomic study. They grew optimally at 30 °C and in the presence of 2–3 % (w/v) NaCl. Strains DSW10-10^T and DSW10-19 were characterized chemotaxonomically as containing Q-8 as the predominant ubiquinone and C_{18 : 1}7c, C_{16 : 0} and C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH as the major fatty acids. Their DNA G+C contents were 45·3–45·7 mol%. Strains DSW10-10^T and DSW10-19 exhibited a 16S rRNA gene sequence similarity value of 100 % and possessed a mean DNA–DNA relatedness level of 85 %. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains DSW10-10^T and DSW10-19 fell within the radiation of the cluster encompassed by the genus Marinomonas. Strains DSW10-10^T and DSW10-19 had 16S rRNA gene sequence similarity levels of 95·7–97·7 % with respect to the type strains of Marinomonas species with validly published names. Levels of DNA–DNA relatedness were low enough to indicate that the two strains constitute a distinct Marinomonas species. On the basis of phenotypic data and phylogenetic and genetic distinctiveness, strains DSW10-10^T (=KCTC 12394^T=DSM 17202^T) and DSW10-19 were placed in the genus Marinomonas as members of a novel species, Marinomonas dokdonensis sp. nov.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains DSW10-10^T and DSW10-19 and Marinomonas communis LMG 2864^T are DQ011526, DQ011527 and DQ011528, respectively.

A table showing the cellular fatty acid composition of Marinomonas dokdonensis sp. nov. is available as supplementary material in IJSEM Online.

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