Flavobacterium suzhouense sp. nov., isolated from farmland river sludge

A Gram-stain-negative bacterium, designated XIN-1(T), was isolated from a farmland river sludge sample in Suzhou, China. Cells of strain XIN-1(T) were strictly aerobic, non-motile and rod-shaped. Strain XIN-1(T) grew optimally at pH 7.0 and 28 °C. Phylogenetic analysis of the 16S rRNA gene sequences showed that strain XIN-1(T) was most closely related to Flavobacterium hauense BX12(T) (98.2 % sequence similarity), followed by Flavobacterium beibuense F44-8(T) (96.3 %). The major respiratory quinone was menaquinone-6 and the major polar lipid was phosphatidylethanolamine. The major fatty acids (>5 %) were summed feature 3 (comprising C16 : 1ω7c and/or C16 : 1ω6c), summed feature 4 (comprising iso-C17 : 1 I and/or anteiso-C17 : 1 B), iso-C15 : 0, C16 : 0 and iso-C17 : 0 3-OH. The genomic DNA G+C content of strain XIN-1(T) was 39.8 mol%. Strain XIN-1(T) showed low DNA-DNA relatedness with F. hauense BX12(T) (38.7±0.5 %). On the basis of genotypic and phenotypic data, strain XIN-1(T) is considered to represent a novel species of the genus Flavobacterium, for which the name Flavobacterium suzhouense sp. nov. is proposed. The type strain is XIN-1(T) ( = CCTCC AB 2014200(T) = KCTC 42107(T)).