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Abstract

A Gram-stain-negative, strictly aerobic, non-flagellated, non-gliding, oxidase- and catalase-positive, white-pigmented and rod-shaped bacterium, designated strain XH122, was isolated from a surface seawater sample collected from the South Pacific Gyre (45° 58′ E 163° 11′ S) during Integrated Ocean Drilling Program Expedition 329.Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain XH122 belonged to the genus Leucothrix and showed highest 16S rRNA gene sequence similarity to Leucothrix mucor DSM 2157 (94.3 %). It showed lower sequence similarities ( < 90.7 %) with all other representatives of the class . Optimal growth occurred in the presence of 2 % (w/v) NaCl, at pH 8.0 and at 28 °C. The DNA G+C content of strain XH122 was 46.2 mol%. The major fatty acids were C, Cω9 and Cω9. The major respiratory quinone was ubiquinone-8 (Q-8). The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol and diphosphatidylglycerol. On the basis of data from this polyphasic study, strain XH122 is considered to represent a novel species of the genus , for which the name sp. nov. is proposed. The type strain is XH122 ( = DSM 25984 = JCM 18388).

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2015-08-01
2024-12-14
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