Flavobacterium fluvii sp. nov., isolated from stream sediment

An aerobic, yellow-pigmented, Gram-staining-negative bacterium, designated strain H7(T), was isolated from sediment of Gazwa stream in Jinju city, South Korea. Cells of strain H7(T) were non-motile, straight rods that produced flexirubin pigments and showed catalase- and oxidase activities. Strain H7(T) contained iso-C(15 : 0,) anteiso-C(15 : 0) and summed feature 3 (comprising C(16 : 1)omega7c and/or iso-C(15 : 0) 2-OH) as the main fatty acids and menaquinone-6 (MK-6) as the major isoprenoid quinone. The DNA G+C content of strain H7(T) was 37.2 mol%. Comparative 16S rRNA gene sequence analysis showed that strain H7(T) formed a distinct phyletic line within the genus Flavobacterium. Based on 16S rRNA gene sequence similarities, the novel strain was most closely related to Flavobacterium limicola ST-82(T) and Flavobacterium resistens BD-b365(T) with 97.2 % and 97.0 % gene sequence similarities, respectively. The DNA-DNA relatedness of the novel strain with these species was only 18 % and 14 %, respectively. On the basis of phenotypic data and molecular properties, strain H7(T) represents a novel species within the genus Flavobacterium, for which the name Flavobacterium fluvii sp. nov. is proposed. The type strain is H7(T) (=KACC 12818(T)=DSM 19978(T)).