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Flavobacterium defluvii sp. nov., isolated from activated sludge

¹ Division of Applied Life Science, EB-NCRC, PMBBRC, Gyeongsang National University, Jinju 660-701, Republic of Korea
² Department of Microbiology and Research Institute of Life Science, Gyeongsang National University, Jinju 660-701, Republic of Korea
³ Jeju Hi-Tech Industry Development Institute, 4-8 Ara-1 dong, Jeju 690-121, Republic of Korea

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

A Gram-negative bacterium, designated strain EMB117^T, was isolated from a municipal wastewater treatment plant and characterized by polyphasic taxonomy. The cells were non-spore-forming rods that showed gliding motility. Optimal growth occurred at 25–30 °C and pH 7.0–8.0. Strain EMB117^T contained phosphatidylethanolamine as the predominant polar lipid, and the major fatty acids were iso-C_{15 : 0}, iso-C_{17 : 0} 3-OH, iso-C_{15 : 0} 3-OH and summed feature 3 (C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH). The G+C content of the genomic DNA was 33.5 mol% and the major isoprenoid quinone was MK-6. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain EMB117^T belonged to the genus Flavobacterium and was most closely related to Flavobacterium johnsoniae DSM 425^T (97.8 % sequence similarity). The DNA–DNA relatedness between strain EMB117^T and F. johnsoniae ATCC 17061^T was about 18 %. On the basis of the phenotypic, chemotaxonomic and molecular data, strain EMB117^T represents a novel species within the genus Flavobacterium, for which the name Flavobacterium defluvii sp. nov. is proposed. The type strain is EMB117^T (=KCTC 12612^T=DSM 17963^T).

A transmission electron micrograph of cells of strain EMB117^T is available as a supplementary figure in IJSEM Online.

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