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Pseudoxanthomonas koreensis sp. nov. and Pseudoxanthomonas daejeonensis sp. nov.

¹ Department of Oriental Medicinal Material and Processing, College of Life Science, Kyung Hee University, 1 Seocheon, Kihung Yongin, Kyunggi 449-701, South Korea
² Environmental and Molecular Microbiology Laboratory, Department of Biological Sciences, KAIST (Korea Advanced Institute of Science and Technology), 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea

Correspondence
Sung-Taik Lee
e_stlee{at}kaist.ac.kr

Gram-negative, non-spore-forming, rod-shaped bacteria, T7-09^T and TR6-08^T, were isolated from soil from a ginseng field in South Korea and characterized to determine their taxonomic position. 16S rRNA gene sequence analysis showed that the two isolates shared 99·5 % sequence similarity. Strains T7-09^T and TR6-08^T were shown to belong to the Proteobacteria and showed the highest levels of sequence similarity to Pseudoxanthomonas broegbernensis DSM 12573^T (98·1 %), Pseudoxanthomonas mexicana AMX 26B^T (97·4–97·5 %), Pseudoxanthomonas japonensis 12-3^T (96·5–96·6 %), Pseudoxanthomonas taiwanensis ATCC BAA-404^T (95·7 %) and Xanthomonas campestris ATCC 33913^T (96·3–96·5 %). The sequence similarity values with respect to any species with validly published names in related genera were less than 96·5 %. The detection of a quinone system with Q-8 as the predominant compound and a fatty acid profile with C_{15 : 0} iso as the predominant acid supported the assignment of the novel isolates to the order ‘Xanthomonadales’. The two isolates could be distinguished from the established species of the genus Pseudoxanthomonas by the presence of quantitative unsaturated fatty acid C_{17 : 1} iso 9c and by their unique biochemical profiles. The results of DNA–DNA hybridization clearly demonstrated that T7-09^T and TR6-08^T represent separate species. On the basis of these data, it is proposed that T7-09^T (=KCTC 12208^T=IAM 15116^T) and TR6-08^T (=KCTC 12207^T=IAM 15115^T) be classified as the type strains of two novel Pseudoxanthomonas species, for which the names Pseudoxanthomonas koreensis sp. nov. and Pseudoxanthomonas daejeonensis sp. nov., respectively, are proposed.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains T7-09^T and TR6-08^T are AY550263 and AY550264, respectively.

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