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Sphingomonas dokdonensis sp. nov., isolated from soil

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

A Gram-negative, rod-shaped, Sphingomonas-like bacterial strain, DS-4^T, was isolated from soil of Dokdo, Korea, and its taxonomic position was investigated using a polyphasic approach. Strain DS-4^T grew optimally on trypticase soy agar medium without NaCl at pH 6.0–6.5 and 25 °C. It contained Q-10 as the predominant ubiquinone and C_{18 : 1}7c, C_{16 : 0}, C_{14 : 0} 2-OH and C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH as the major fatty acids. Sphingoglycolipid, phosphatidylcholine, phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine and unidentified phospholipid were the major polar lipids. The DNA G+C content was 66.9 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain DS-4^T fell within the evolutionary radiation comprising Sphingomonas species. Levels of 16S rRNA gene sequence similarity between strain DS-4^T and the type strains of Sphingomonas species ranged from 93.0 to 97.6 %. DNA–DNA relatedness data and differential phenotypic properties, together with the phylogenetic distinctiveness, demonstrated that strain DS-4^T differs from the recognized Sphingomonas species. On the basis of phenotypic, phylogenetic and genetic data, this strain represents a novel species of the genus Sphingomonas, for which the name Sphingomonas dokdonensis sp. nov. is proposed, with DS-4^T (=KCTC 12541^T=CIP 108841^T) as the type strain.

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