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Algoriphagus aquatilis sp. nov., isolated from freshwater of Longhu Lake in Daqing, northeast of China

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, non-spore-forming, non-motile bacterium, strain A8-7T, was isolated from freshwater of a slightly alkaline lake, Longhu Lake in Daqing, northeast of China, and its taxonomic position was studied using a polyphasic approach. Strain A8-7T was aerobic, heterotrophic and positive for catalase and oxidase. It grew at temperature 20-37 °C (optimum at 30 °C), pH 5.5-10.5 (optimum at pH 7.5) and in the presence of 0-3 % (w/v) NaCl. It formed pink-pigmented, smooth, circular and 1-2 mm in diameter colonies on R3A-V agar plates after incubation for 3 days at 30 °C. Cells of strain A8-7T were rods with 0.2–0.4 µm in width and 1.6–4.0 µm in length. The major fatty acids (>10%) were iso-C15: 0 (40.3%) and summed feature 3 (C16:17c and/or iso-C15:0 2-OH, 12.1%). The menaquinone was MK-7. The DNA G+C content was 43 mol% (Tm). Phylogenetic analyses based on 16S rRNA revealed that strain A8-7T was phylogenetically related to members of the genus Algoriphagus, with sequence similarities from 92.6%-95.2% (highest to Algoriphagus mannitolivorans JC2050T). On basis of phenotypic, chemotaxonomic and phylogenetic data, strain A8-7T was considered to represent a novel species of the genus Algoriphagus, for which the name Algoriphagus aquatilis was proposed. The type strain is A8-7T (CGMCC 1.7030T=NBRC 104237T).

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