1887

Abstract

A Gram-stain-negative, non-motile, oxidase- and catalase-positive, rod-shaped bacterium was isolated from a coastal seawater sample from the Arctic Circle and designated strain IMCC9719. On the basis of 16S rRNA gene sequence analysis, it was shown that strain IMCC9719 belonged to the genus Leucothrix and was closely related to the type strains of Leucothrix pacifica (97.6 % similarity) and Leucothrix mucor (95.1 %), while the strain shared <90.6 % sequence similarity with other bacterial species. The average nucleotide identity and genome-to-genome distance values between strain IMCC9719 and L. pacifica JCM 18388 were 71.7 and 16.9 %, respectively. The DNA G+C content of strain IMCC9719 was 43.5 mol%. Optimum growth of strain IMCC9719 was observed at 15 °C, at pH 7.5–8.5 and in the presence of 2.0–2.5 % (w/v) NaCl. The major fatty acids were summed feature 3 (C16 : 1 ω7c and/or C16 : 1ω6c), summed feature 8 (C18 : 1 ω6c and/or C18 : 1 ω7c) and C16 : 0. Cells of strain IMCC9719 contained diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, an unidentified polar lipid, an unidentified aminophospholipid and two unidentified phospholipids. The major respiratory quinone was ubiquinone-8 (Q-8). Based on the taxonomic data collected in this study, strain IMCC9719 represents a novel species of the genus Leucothrix , for which the name Leucothrix arctica sp. nov. is proposed. The type strain is IMCC9719 (=KACC 18010=NBRC 110382).

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2018-12-04
2019-12-08
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