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Segetibacter koreensis gen. nov., sp. nov., a novel member of the phylum Bacteroidetes, isolated from the soil of a ginseng field in South Korea

Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea

Correspondence
Wan-Taek Im
wandra{at}kaist.ac.kr
Sung-Taik Lee
e_stlee{at}kaist.ac.kr

A novel strain, designated Gsoil 664^T, isolated from the soil of a ginseng field in South Korea, was characterized by a polyphasic approach to clarify its taxonomic position. The isolate was Gram-negative, strictly aerobic, heterotrophic, non-motile, non-spore-forming and possessed rod-shaped cells. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the novel isolate formed a cluster with several uncultured bacterial clones and with the established genera Terrimonas, Niastella and Chitinophaga in the phylum Bacteroidetes. However, the isolate was clearly separated from these genera: the gene sequence similarities with respect to the type strains of recognized species from closely related genera ranged from 86.7 to 90.7 %. The G+C content of the genomic DNA was 40.4 mol%. The predominant isoprenoid quinone was MK-7. The major fatty acids were iso-C_{15 : 0}, iso-C_{17 : 0} 3-OH, iso-C_{15 : 1} and C_{16 : 1}5c. The results of physiological and biochemical tests allowed the genotypic and phenotypic differentiation of strain Gsoil 664^T from recognized species of related genera. On the basis of the polyphasic evidence, Gsoil 664^T represents a novel genus and species, for which the name Segetibacter koreensis gen. nov., sp. nov. is proposed. The type strain of S. koreensis is Gsoil 664^T (=KCTC 12655^T=DSM 18137^T).