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Flavobacterium hydrocarbonoxydans sp. nov., isolated from polluted soil.

This paper presents a polyphasic taxonomic study of a Gram-stain-negative bacterium designated GA093T, a soil isolate capable of benzo(α)pyrene degradation. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that strain GA093T is a member of the genus Flavobacterium, and formed an independent phylogenetic line while clustering with the type strains of Flavobacterium hibernum, Flavobacterium branchiarum and Flavobacterium hydatis. Strain GA093T was facultatively anaerobic, and could grow at 4-33 °C (optimum, 30 °C), at pH 6-11 (optimum, pH 7) and in the presence of 0-2 % (w/v) NaCl (optimum, 0 %). Strain GA093T was capable of producing acid from various carbon sources, which was comparable to other related species of Flavobacterium. The strain contained MK-6 as the only isoprenoid quinone, iso-C15 : 0 as the major cellular fatty acid, phosphatidylethanolamine and phosphatidylinositol as diagnostic polar lipids, and sym-homospermidine as the major polyamine. The chemotaxonomic properties of strain GA093T were consistent with the general properties of Flavobacterium except the presence of phosphatidylinositol, which distinguished it from other related species. The total stretch of the obtained genome of GA093T was 5.05 Mbp, and the DNA G+C content was 34.79 mol%. The genome contained genes potentially related to the degradation of aromatic hydrocarbons. On the basis of the present polyphasic analysis, strain GA093T was found to have properties that distunguished it as representing a novel species of the genus Flavobacterium, for which the name Flavobacterium hydrocarbonoxydans sp. nov. is proposed. The type strain is GA093T (=KCTC 72594T=LMG 31760T).