Flavobacterium aurantiibacter sp. nov., an orange-pigmented bacterium isolated from cyanobacterial aggregates in a eutrophic lake

A bacterial strain, designated TH167 T , was isolated from cyanobacterial aggregates in eutrophic Lake Taihu in China. Cells were observed to be slightly curved rod-shaped, motile by gliding, aerobic, Gram-stain-negative, proteorhodopsin-containing. Optimal growth was obtained at pH 7.0 (range: 6.0-9.0), 28 °C (range: 4-32 °C) and 0 % (w/v) NaCl (range: 0-2.0 %) in Reasoner's 2A broth. No growth was observed at 37 °C. The cells were found to be positive for catalase and oxidase activities. The major fatty acids (>10 %) were identified as iso-C15 : 0, iso-C15 : 1 G and anteiso-C15 : 0. The major polar lipids of the isolate comprised phosphatidylethanolamine, one unidentified phospholipid and two unidentified aminolipids. The major respiratory quinone was menaquinone-6. The genomic G+C content of strain TH167 T was 40.4 mol% based on total genome calculations. Based on similarities of 16S rRNA gene sequences, strain TH167 T was affiliated with the genus Flavobacterium, exhibiting the highest sequence similarities to Flavobacterium eburneum SA31 T (94.16 %), Flavobacterium yanchengensehg T (94.09 %) and Flavobacterium lacus NP180 T (93.95 %). The phenotypic, chemotaxonomic and phylogenetic properties, and genome analysis suggested that strain TH167 T represented a novel species within the genus Flavobacterium, for which the name Flavobacterium aurantiibacter sp. nov. is proposed. The type strain is TH167 T (=CGMCC 1.15805 T =LMG 29719 T ).