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Pseudoxanthomonas sacheonensis sp. nov., isolated from BTEX-contaminated soil in Korea, transfer of Stenotrophomonas dokdonensis Yoon et al. 2006 to the genus Pseudoxanthomonas as Pseudoxanthomonas dokdonensis comb. nov. and emended description of the genus Pseudoxanthomonas

Dae Sung Lee^1,, Seung Hyun Ryu^2,, Hyun Wook Hwang¹, Young-Ju Kim¹, Minjeong Park², Jung Ro Lee², Sang-Suk Lee³ and Che Ok Jeon⁴

¹ Department of Environmental Engineering, Kyungpook National University, Sankyuk-dong, Buk-gu, Daegu 702-701, Republic of Korea
² Division of Applied Life Science (BK21 program), EB-NCRC, Gyeongsang National University, Jinju 660-701, Republic of Korea
³ Department of Animal Science and Technology, Sunchon National University, Sunchon 540-742, Republic of Korea
⁴ Department of Life Science, Chung-Ang University, Seoul 156-756, Republic of Korea

Correspondence
Che Ok Jeon
cojeon{at}cau.ac.kr

A Gram-negative, strictly aerobic, rod-shaped bacterium, designated strain BD-c54^T, was isolated from BTEX (benzene, toluene, ethylbenzene and xylenes)-contaminated soil in Sacheon, Korea. Growth of strain BD-c54^T was observed at 15–35 °C (optimum 25–30 °C) and pH 6.0–9.5 (optimum pH 7.0–8.0). The predominant fatty acids were iso-C_{15 : 0}, iso-C_{17 : 1}9c, iso-C_{11 : 0} 3-OH, iso-C_{16 : 0}, iso-C_{11 : 0} and iso-C_{17 : 0}. The strain contained large amounts of phosphatidylethanolamine, phosphatidylglycerol and diphosphatidylglycerol and a small amount of an unknown amino-group-containing polar lipid as polar lipids. The major quinone was ubiquinone-8 (Q-8) and the G+C content of the genomic DNA was 67.5 mol%. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain BD-c54^T formed a tight phylogenetic lineage with Pseudoxanthomonas yeongjuensis GR12-1^T within the genus Pseudoxanthomonas and was most closely related to P. yeongjuensis GR12-1^T and [Stenotrophomonas] dokdonensis DS-16^T, with 98.3 and 96.6 % 16S rRNA gene sequence similarity, respectively. The DNA–DNA relatedness between strain BD-c54^T and P. yeongjuensis GR12-1^T was 24.5 %. On the basis of chemotaxonomic data and molecular properties, strain BD-c54^T represents a novel species within the genus Pseudoxanthomonas, for which the name Pseudoxanthomonas sacheonensis sp. nov. is proposed. The type strain is BD-c54^T (=KCTC 22080^T =DSM 19373^T). In addition, the transfer of Stenotrophomonas dokdonensis to Pseudoxanthomonas as Pseudoxanthomonas dokdonensis comb. nov. and an emended description of the genus Pseudoxanthomonas are proposed.

These authors contributed equally to this work.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain BD-c54^T is EF575564.

A transmission electron micrograph of cells of strain BD-c54^T and results of TLC of its polar lipids are available as supplementary material with the online version of this paper.

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