Characterization of Flavobacterium aquimarinum sp. nov., a halotolerant bacterium isolated from seawater

Sylvia Kristyanto; Tuan Manh Nguyen; Dhiraj Kumar Chaudhary; Sang-Seob Lee; Jaisoo Kim

doi:10.1007/s12275-018-7454-3

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Characterization of Flavobacterium aquimarinum sp. nov., a halotolerant bacterium isolated from seawater: Sylvia Kristyanto ¹, Tuan Manh Nguyen ^1,2, Dhiraj Kumar Chaudhary ¹, Sang-Seob Lee ¹, Jaisoo Kim ¹; Journal of Microbiology 2018;56(5):317-323.
DOI: https://doi.org/10.1007/s12275-018-7454-3
Published online: May 2, 2018

¹Department of Life Science, College of Natural Sciences and Engineering, Kyonggi University, Suwon 16227, Republic of Korea, ²Thai Nguyen University of Agriculture and Forestry, Quyet Thang, Thai Nguyen, Vietnam¹Department of Life Science, College of Natural Sciences and Engineering, Kyonggi University, Suwon 16227, Republic of Korea, ²Thai Nguyen University of Agriculture and Forestry, Quyet Thang, Thai Nguyen, Vietnam

Corresponding author: Jaisoo Kim , Tel: +82-31-249-9648;,

Received: 26 October 2017 • Revised: 30 January 2018 • Accepted: 2 March 2018

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Abstract

A novel, aerobic, Gram-stain-negative, non-motile, non-spore forming, rod-shaped bacterium, designated strain Dol 15-39T, was isolated from a seawater sample near Geoje Island in the South Sea, Republic of Korea. The strain was found to be oxidase-negative and catalase-positive. The isolate was observed to grow at temperatures from 4 to 37°C, at salinities of up to 7%, and at pH levels from 6 to 9; moreover, it was not able to degrade starch, DNA, esculin, or tyrosine. Phylogenetic analysis based on 16S rRNA gene sequences showed that Dol 15-39T was most closely related to Flavobacterium jumunjinense HME7102T with a sequence similarity of 97.3%. However, the levels of DNA-DNA relatedness between Dol 15-39T and the most closely related species were much lower than 70%, confirming that they represented distinct genomic species. The genomic DNA G + C content of Dol 15-39T was calculated to be 32.6 mol%. MK-6 was the predominant respiratory quinine, while iso-C15:0 (25.0%), iso- C15:1 G (17.0%), and iso-C17:0 3-OH (10.4%) were the major cellular fatty acids. Phosphatidylethanolamine was identified as a major polar lipid, while various unidentified aminolipids and polar lipids were also detected. Based on polyphasic taxonomic data, Dol 15-39T represents a novel species of the genus Flavobacterium, for which the name F. aquimarinum sp. nov. is proposed. The type strain is accessible under the culture collection numbers (KEMB 9005-617T = JCM 31930T).

Keywords: Flavobacterium aquimarinum sp. nov.;seawater;halotolerant;Flavobacteriaceae;bacteroidetes

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Characterization of Flavobacterium aquimarinum sp. nov., a halotolerant bacterium isolated from seawater

J. Microbiol. 2018;56(5):317-323. Published online May 2, 2018

DOI: https://doi.org/10.1007/s12275-018-7454-3

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