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Algoriphagus aquatilis sp. nov., isolated from a freshwater lake

¹ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
² Water Supply Company of Daqing Petroleum Administration, No. 49, Aiguo Road, Ranghulu District, Daqing 163453, PR China

Correspondence
Zhi-Pei Liu
liuzhp{at}sun.im.ac.cn

A Gram-negative, non-spore-forming, non-motile bacterium, strain A8-7^T, was isolated from fresh water of a slightly alkaline lake, Longhu Lake, in Daqing, north-east China, and its taxonomic position was studied by using a polyphasic approach. Strain A8-7^T was aerobic, heterotrophic and positive for catalase and oxidase. It grew at 20–37 °C (optimum 30 °C) and pH 5.5–10.5 (optimum pH 7.5) and in the presence of 0–3 % (w/v) NaCl. It formed pink-pigmented, smooth and circular colonies, 1–2 mm in diameter, on R3A-V agar plates after incubation at 30 °C for 3 days. Cells of strain A8-7^T were rods, 0.2–0.4 µm wide and 1.6–4.0 µm long. The major fatty acids (>10 %) were iso-C_{15 : 0} (40.3 %) and summed feature 3 (C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH; 12.1 %). The menaquinone was MK-7. The DNA G+C content was 43 mol% (T_m). Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain A8-7^T was phylogenetically related to members of the genus Algoriphagus, with sequence similarities of 92.6–95.2 %, the highest sequence similarity being to the sequence from Algoriphagus mannitolivorans IMSNU 14012^T. On the basis of phenotypic, chemotaxonomic and phylogenetic data, strain A8-7^T was considered to represent a novel species of the genus Algoriphagus, for which the name Algoriphagus aquatilis sp. nov. is proposed. The type strain is A8-7^T (=CGMCC 1.7030^T =NBRC 104237^T).

Maximum-parsimony and maximum-likelihood trees based on 16S rRNA gene sequences and a table of cellular fatty acid contents of strain A8-7^T and strains of other Algoriphagus species are available as supplementary material with the online version of this paper.

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