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Flavobacterium resistens sp. nov., isolated from stream sediment

Seung Hyun Ryu^1,, Jin Ho Park^1,, Jeong Chan Moon¹, Youlboong Sung², Sang-Suk Lee³ and Che Ok Jeon⁴

¹ Division of Applied Life Science (BK21 program), EB-NCRC, Gyeongsang National University, Jinju 660-701, Republic of Korea
² Research Institute of Industrial Science and Technology, Environment and Energy Research Center, Gwangyang 545-090, 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

An aerobic, yellow-pigmented, Gram-negative bacterium, designated strain BD-b365^T, was isolated from sediment of the Hakjang stream in Busan, South Korea. Growth was observed at 15–40 °C (optimum 20–30 °C) and at pH 6.0–9.5 (optimum pH 7.0–8.0). Cells were non-spore-forming rods that showed gliding motility and contained branched and hydroxy fatty acids. The G+C content of the genomic DNA was 35.4 mol%. The major respiratory quinone was menaquinone-6 (MK-6). The major polar lipid of strain BD-b365^T was phosphatidylethanolamine. Comparative 16S rRNA gene sequence analysis showed that strain BD-b365^T formed a distinct phyletic line within the genus Flavobacterium. Based on levels of 16S rRNA gene sequence similarity, the novel strain was related most closely to Flavobacterium aquidurense WB 1.1-56^T, but the level of DNA–DNA relatedness between these two strains was only 9.6 %. On the basis of phenotypic and genotypic data, it is clear that strain BD-b365^T represents a novel species of the genus Flavobacterium, for which the name Flavobacterium resistens sp. nov. is proposed. The type strain is BD-b365^T (=KCTC 22078^T =DSM 19382^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain BD-b365^T is EF575563.

A transmission electron micrograph of cells of strain BD-b365^T, an extended neighbour-joining tree and a table comparing the fatty acid compositions of strain BD-b365^T and its closest neighbours are available as supplementary material with the online version of this paper.