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Nocardioides dubius sp. nov., isolated from an alkaline soil

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

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

A Gram-positive, rod- or coccus-shaped bacterial strain, KSL-104^T, was isolated from an alkaline soil from Korea and its taxonomic position was investigated by a polyphasic approach. Strain KSL-104^T grew optimally at pH 7·0–8·0 and 30 °C. It was characterized chemotaxonomically as having a cell-wall peptidoglycan type based on LL-2,6-diaminopimelic acid with MK-8(H₄) as the predominant menaquinone. The major fatty acid was iso-C_{16 : 0} and the major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and phosphatidylinositol. The DNA G+C content was 70·6 mol%. A neighbour-joining phylogenetic tree based on 16S rRNA gene sequences revealed that strain KSL-104^T joined the cluster comprising Nocardioides jensenii and Marmoricola aurantiacus. The cellular fatty acid profile of strain KSL-104^T was different from that of M. aurantiacus. Strain KSL-104^T and the type strain of N. jensenii exhibited a 16S rRNA gene sequence similarity value of 97·1 % and a mean DNA–DNA relatedness value of 13 %. Levels of 16S rRNA gene sequence similarity between strain KSL-104^T and the type strains of other Nocardioides species were in the range 94·0–96·5 %. On the basis of phenotypic, phylogenetic and genetic data, strain KSL-104^T (=KCTC 9992^T=JCM 13008^T) represents a novel species of the genus Nocardioides, for which the name Nocardioides dubius sp. nov. is proposed.

Published online ahead of print on 10 June 2005 as DOI 10.1099/ijs.0.63748-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Nocardioides dubius sp. nov. KSL-104^T is AY928902.

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