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Abstract

A Gram-stain-negative, facultatively anaerobic, motile and rod-shaped strain, designed H2, was isolated from the Western Pacific Ocean, and subjected to a taxonomic investigation using a polyphasic approach. Strain H2 grew at 15–40 °C and pH 6.0–9.0 (optimum 37 °C and pH 6.5), and with 1–10 % (w/v) NaCl (optimum 2 %). The predominant respiratory quinone was ubiquinone-10 (Q-10) and the major fatty acids identified were C19 : 0 cyclo ω8c, C18 : 1 ω7c, C18 : 0 and 11-methyl-C18 : 1 ω7c. The polar lipids of strain H2 consisted of phosphatidylglycerol, one unknown phospholipid, one unknown glycolipid and three unidentified aminolipids. The DNA G+C content was 75.0 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain H2 formed a distinct clade belong to the family Rhodospirillaceae within the Alphaproteobacteria . On the basis of morphological, physiological and chemotaxonomic characteristics, together with the results of phylogenetic analysis, strain H2 represents a novel species in a new genus in the family Rhodospirillaceae, for which the name Marinibaculum pumilum gen. nov., sp. nov. is proposed. The type strain of the type species is H2(=MCCC 1K02279=KCTC 42964).

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2016-11-01
2019-10-19
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