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Marivita gen. nov. in the family Rhodobacteraceae with two species, Marivita cryptomonadis sp. nov. and Marivita litorea sp. nov., isolated from marine habitats

¹ Seoul National University;
² Kunsan National University

³ E-mail: bccho{at}snu.ac.kr

Two strictly aerobic, Gram-negative and rod-shaped bacteria containing photosynthesis-related genes, designated CL-SK44^T and CL-JM1^T, were isolated from a culture of Cryptomonas sp. and coastal seawater of Korea, respectively. Phylogenetic analysis of 16S rRNA gene sequences revealed that the two strains were related to the genera Thalassobius (95.3-96.7%), Pelagibaca (95.3-96.0%) and Donghicola (95.6%) in the family Rhodobacteraceae. However, the two strains did not form a robust clade with any species of the Roseobacter clade, forming a distinct clade. The major polar lipids of the strains were phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, diphosphatidyglycerol, an unidentified aminolipid and an unidentified lipid, which were distinguishable from those of related genera examined. Although the 16S rRNA gene sequence similarity between strains CL-SK44^T and CL-JM1^T was very high (99.1%), DNA-DNA relatedness between the strains was 13%, suggesting that they are genomically distinct species. In addition, the two strains could be differentiated by the presence of a minor polar lipid, hydrolysis of gelatin and utilization of carbon sources. Based on the polyphasic data obtained in this study, strains CL-SK44^T and CL-JM1^T represent separate species within a novel genus of the family Rhodobacteraceae, for which the names Marivita cryptomonadis gen. nov., sp. nov. (type species) and Marivita litorea sp. nov. are proposed. The type strains of Marivita cryptomonadis and Marivita litorea are CL-SK44^T (= KCCM 90070^T = JCM 15447^T) and CL-JM1^T (= KCCM 90071^T = JCM 15446^T), respectively.