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Sphingomonas insulae sp. nov., isolated from soil

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

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

A Gram-negative, motile and rod-shaped Sphingomonas-like bacterial strain, DS-28^T, was isolated from the soil of Dokdo, Korea, and was subjected to a polyphasic taxonomic study. It grew optimally at around pH 6.5 and 25 °C in the presence of 0–0.5 % NaCl. It contained Q-10 as the predominant ubiquinone and C_{18 : 1}7c, C_{14 : 0} 2-OH and C_{16 : 0} as the major fatty acids. Major polar lipids were sphingoglycolipid, phosphatidylcholine, phosphatidylglycerol and phosphatidylethanolamine. The DNA G+C content was 67.0 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain DS-28^T belonged to the genus Sphingomonas. Levels of 16S rRNA gene sequence similarity between strain DS-28^T and the type strains of Sphingomonas species were in the range 93.3–98.3 %. DNA–DNA relatedness data and differential phenotypic properties, together with the phylogenetic distinctiveness, demonstrated that strain DS-28^T is distinguishable from recognized Sphingomonas species. On the basis of phenotypic, phylogenetic and genetic data, strain DS-28^T represents a novel species of the genus Sphingomonas, for which the name Sphingomonas insulae sp. nov. is proposed. The type strain is DS-28^T (=KCTC 12872^T=JCM 14603^T).

A two-dimensional thin-layer chromatogram of polar lipids of Sphingomonas insulae DS-28^T is available with the online version of this paper.

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