Aquicoccus porphyridii gen. nov., sp nov., isolated from a small marine red alga, Porphyridium marinum

초록

A Gram-stain-negative, non-motile and aerobic bacterial strain, designated L1 8-17(T), was isolated from a marine alga, Porphyridium marinum, in South Korea. Cells of strain L1 8-17(T) were found to be oxidase-and catalase-positive cocci without flagella. Growth of strain L1 8-17(T) was observed at 20-40 degrees C (optimum, 37 degrees C), pH 6.0-10.0 (optimum, pH 7.0-8.0) and in the presence of 0-7% (w/v) NaCl (optimum, 2-3 %). The isoprenoid quinone detected was only ubiquinone-10. Summed feature 8 (comprising C-18:1 omega 7c/C-18:1 omega 6c) and C-16:0 were detected as major cellular fatty acids. The major polar lipids of strain L1 8-17(T) consisted of phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, an unidentified aminolipid, an unidentified phospholipid and an unidentified lipid. The G+C content of the genomic DNA was 59.3 mol%. Strain L1 8-17(T) was most closely related to Marimonas arenosa CAU 1311(T), Tropicibacter naphthalenivorans C02(T) and Donghicola eburneus SW-277(T) with 96.68, 96.68 and 96.60% 16S rRNA gene sequence similarities, respectively, but the strain formed a phylogenetic lineage clearly distinct from them within the family Rhodobacteraceae. On the basis of phenotypic, chemotaxonomic and molecular properties, strain L1 8-17(T) represents a novel genus of the family Rhodobacteraceae, for which the name Aquicoccus porphyridii gen. nov., sp. nov. is proposed. The type strain of the type species is L1 8-17(T) (KACC 18806(T)=JCM 31543(T)).

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