title: Ruegeria meonggei sp. nov., an alphaproteobacterium isolated from ascidian Halocynthia roretzi.
abstract: A Gram-negative, strictly aerobic, non-flagellated and rod-shaped bacterial strain, designated MA-E2-3(T), was isolated from an ascidian (Halocynthia roretzi) collected from the South Sea, South Korea. Strain MA-E2-3(T) was found to grow optimally at 30 °C, at pH 7.0-8.0 and in the presence of 2.0-3.0 % (w/v) NaCl. A neighbour-joining phylogenetic tree based on 16S rRNA gene sequences revealed that strain MA-E2-3(T) fell within the clade comprising Ruegeria species, clustering consistently with the type strain of Ruegeria halocynthiae, with which it exhibited 98.2 % sequence similarity. Sequence similarities to the type strains of the other recognized Ruegeria species were 94.7-97.7 %. Strain MA-E2-3(T) was found to contain Q-10 as the predominant ubiquinone and C18:1 ω7c as the predominant fatty acid. The major polar lipids of strain MA-E2-3(T) were identified as phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, one unidentified aminolipid and one unidentified lipid. The DNA G+C content of strain MA-E2-3(T) was determined to be 58.0 mol%. Mean DNA-DNA relatedness values between strain MA-E2-3(T) and the type strains of four phylogenetically closely related Ruegeria species were in the range of 13-23 %. The differential phenotypic properties, together with the phylogenetic and genetic distinctiveness, revealed that strain MA-E2-3(T) is separated from other Ruegeria species. On the basis of the data presented, strain MA-E2-3(T) (=KCTC 32450(T) = CECT 8411(T)) represents a novel species of the genus Ruegeria, for which the name Ruegeria meonggei sp. nov. is proposed.
authors.affiliation: Biotechnology Research Division, National Fisheries Research and Development Institute (NFRDI), Gijang, Busan, 619-705, South Korea.
authors.forename: Young-Ok
authors.initials: YO
authors.lastname: Kim
authors.forename: Sooyeon
authors.initials: S
authors.lastname: Park
authors.forename: Bo-Hye
authors.initials: BH
authors.lastname: Nam
authors.forename: Yong-Taek
authors.initials: YT
authors.lastname: Jung
authors.forename: Dong-Gyun
authors.initials: DG
authors.lastname: Kim
authors.forename: Jung-Hoon
authors.initials: JH
authors.lastname: Yoon
mesh_terms: D000818:Animals; D001482:Base Composition; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D005227:Fatty Acids / Q000737:chemistry; D008969:Molecular Sequence Data; D010641:Phenotype; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S; D041902:Rhodobacteraceae / Q000737:chemistry / Q000145:classification* / Q000235:genetics; D014561:Urochordata / Q000382:microbiology*
chemical_list: D004269:DNA, Bacterial; D005227:Fatty Acids; D012336:RNA, Ribosomal, 16S