Roseovarius aquimarinus sp nov., a slightly halophilic bacterium isolated from seawater

Abstract

A Gram-stain-negative, non-spore-forming, rod-shaped, motile, facultatively anaerobic bacterium, designated CAU 1059(T), was isolated from a seawater sample from Jeju Island, Republic of Korea. The bacterium grew optimally at 37 degrees C, at pH 7.0 and in the presence of 2 % (w/v) NaCI. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CAU 1059(T) belonged to the genus Roseovarius. It exhibited only 91.5-96.9 % sequence similarity to the type strains of recognized Roseovarius species. Similar to other species of the genus Roseovarius, strain CAU 1059(T) had ubiquinone-10 (Q-10) as the predominant ubiquinone and C-16 : 0 and summed feature 8 (C-18 : 1 omega 7c/omega 6c) as the major fatty acids. The polar lipid pattern consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and phosphatidylcholine; three unidentified phospholipids, two aminolipids, an aminophospholipid and nine other lipids were also found. The G-EC content of the genomic DNA was 61.9 mol%. On the basis of the data provided, strain CAU 1059(T) should be classified as representing a novel species of the genus Roseovarius, for which the name Roseovarius aquimarinus sp. nov. is proposed. The type strain is CAU 1059(T) (= KCTC 32014(T)=CCUG 64792(T)).