Albirhodobacter confluentis sp nov., isolated from an estuary

초록

A Gram-stain-negative and strictly aerobic, moderately halophilic bacterium, designated strain S1-47(T), was isolated from estuary sediment in South Korea. Cells were non-motile rods showing oxidase-and catalase-positive activities. Growth was observed at 10-30 degrees C (optimum, 25 degrees C), at pH 5.0-8.0 (optimum, pH 6.0-7.0) and in the presence of 0-6.0% (w/v) NaCl (optimum, 2.0 %). Strain S1-47(T) contained summed feature 3 (comprising C-16:1 omega 7c and/or C-16:1 omega 6c), summed feature 8 (comprising C-18:1 omega 7c and/or C-18:1 omega 6c) and C-16:0 as major cellular fatty acids and ubiquinone-10 as the sole isoprenoid quinone. Phosphatidylethanolamine, an unidentified aminolipid, an unidentified phospholipid and three unidentified lipids were detected as polar lipids. The G+C content of the genomic DNA was 69.3 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain S1-47(T) formed a tight phylogenetic lineage with Albirhodobacter marinus N9(T). Strain S1-47(T) was most closely related to Albirhodobacter marinus N9(T) with a 99.4% 16S rRNA gene sequence similarity. DNA-DNA relatedness levels between strain S1-47(T) and the type strain of Albirhodobacter marinus were 49.8-52.2 %. Based on the phenotypic, chemotaxonomic and molecular features, strain S1-47(T) clearly represents a novel species of the genus Albirhodobacter, for which the name Albirhodobacter confluentis sp. nov. is proposed. The type strain is S1-47(T) (=KACC 18804(T) =JCM 31536(T)).

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