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Dokdonella koreensis gen. nov., 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

Two Gram-negative, motile, non-spore-forming and rod-shaped bacterial strains, DS-123^T and DS-140, were isolated from soil and their taxonomic positions were investigated by a polyphasic study. Strains DS-123^T and DS-140 grew optimally at 30 °C and pH 6·5 without NaCl. They contained Q-8 as the predominant ubiquione and iso-C_{17 : 1}9c, iso-C_{17 : 0} and iso-C_{15 : 0} as the major fatty acids. Major polar lipids detected in the two strains were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and an amino-group-containing lipid that was ninhydrin-positive. Their DNA G+C contents were 71·0 mol%. Strains DS-123^T and DS-140 exhibited no difference in their 16S rRNA gene sequences and possessed a mean DNA–DNA relatedness level of 92 %. Phylogenetic trees based on 16S rRNA gene sequences showed that strains DS-123^T and DS-140 formed a distinct evolutionary lineage within the Gammaproteobacteria. The 16S rRNA gene sequences of strains DS-123^T and DS-140 exhibited similarity values of less than 94·1 % to members of the Gammaproteobacteria. Strains DS-123^T and DS-140 were distinguished from phylogenetically related genera by differences in some phenotypic properties. On the basis of phenotypic, phylogenetic and genetic data, it is proposed that strains DS-123^T (=KCTC 12396^T=DSM 17203^T) and DS-140 be classified in a novel genus and species, Dokdonella koreensis gen. nov., sp. nov.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains DS-123^T and DS-140 are AY987368 and AY987369, respectively.

A transmission electron micrograph of strain DS-123^T is available as supplementary material in IJSEM Online.

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