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Nocardioides hankookensis 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-positive, non-motile, rod-shaped bacterial strain, DS-30^T, was isolated from soil from Dokdo, Korea, and its taxonomic position was investigated by means of a polyphasic study. Strain DS-30^T grew optimally at pH 6.0–7.0 and 25 °C in the presence of 0–0.5 % (w/v) NaCl. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain DS-30^T fell within the genus Nocardioides, forming a coherent cluster with the type strains of Nocardioides aquiterrae and Nocardioides pyridinolyticus, with which it exhibited 16S rRNA gene sequence similarity values of 98.1 and 98.3 %, respectively. Strain DS-30^T exhibited 16S rRNA gene sequence similarity values below 96.8 % with respect to the type strains of the other Nocardioides species. The chemotaxonomic properties of strain DS-30^T were consistent with those of the genus Nocardioides: the cell-wall peptidoglycan type was based on LL-diaminopimelic acid, the predominant menaquinone was MK-8(H₄) and the major fatty acids were iso-C_{16 : 0}, C_{17 : 1}8c and C_{18 : 1}9c. The DNA G+C content was 71.3 mol%. Strain DS-30^T exhibited DNA–DNA relatedness levels of 19 and 22 % with respect to the type strains of N. aquiterrae and N. pyridinolyticus, respectively, and could be differentiated from these species with reference to a number of phenotypic characteristics. On the basis of the data obtained, strain DS-30^T represents a novel species of the genus Nocardioides, for which the name Nocardioides hankookensis sp. nov. is proposed. The type strain is DS-30^T (=KCTC 19246^T =CCUG 54522^T).

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