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Catellibacterium aquatile sp. nov., isolated from freshwater and emended description of the genus Catellibacterium Tanaka et al. 2004

¹ Institute of Microbiology, Chinese Academy of Sciences;
² Water Supply Company of Daqing Petroleum Administration

³ E-mail: liuzhp{at}sun.im.ac.cn

A Gram-negative, rod-shaped, non-pigmented, non-spore-forming bacterial strain that is motile by a single polar flagellum, designated A1-9T, was isolated from Daqing reservoir, northeast of China and its taxonomic position was studied using a polyphasic approach. Strain A1-9T is non-halophilic, strictly aerobic and heterotrophic and lacks carotenoids, internal membranes and genes for photosynthesis (puf genes). Strain A1-9T grows between 10-40°C (optimum at 25-30°C), pH 5.5-9.0 (optimum at pH 6.0-6.5) and tolerates only up to 1.0% NaCl (w/v). Neither phototrophic nor fermentative growth is observed. The predominant ubiquione is UQ-10 and the major fatty acids are C18:17c (70 %). The DNA G+C content is 64.4 mol % (Tm). Phylogenetic analyses based on 16S rRNA revealed that strain A1-9T, together with Catellibacterium nectariphilum AST4T, formed a deep line within the 'Rhodobacter clade' of the family Rhodobacteraceae and showed 94.2% 16S rRNA gene sequence similarity to Catellibacterium nectariphilum AST4T. On basis of phenotypic, chemotaxonomic and phylogenetic data, strain A1-9T is considered to represent a novel species of the genus Catellibacterium, for which the name Catellibacterium aquatile sp. nov. is proposed. The type strain is A1-9T (=CGMCC 1.7029T =NBRC 104254T).