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Ruegeria meonggei sp. nov., an alphaproteobacterium isolated from ascidian Halocynthia roretzi

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Abstract

A Gram-negative, strictly aerobic, non-flagellated and rod-shaped bacterial strain, designated MA-E2-3T, was isolated from an ascidian (Halocynthia roretzi) collected from the South Sea, South Korea. Strain MA-E2-3T 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-E2-3T 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-E2-3T 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-E2-3T were identified as phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, one unidentified aminolipid and one unidentified lipid. The DNA G+C content of strain MA-E2-3T was determined to be 58.0 mol%. Mean DNA–DNA relatedness values between strain MA-E2-3T 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-E2-3T is separated from other Ruegeria species. On the basis of the data presented, strain MA-E2-3T (=KCTC 32450T = CECT 8411T) represents a novel species of the genus Ruegeria, for which the name Ruegeria meonggei sp. nov. is proposed.

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Acknowledgments

This work was supported by grants from the National Fisheries Research and Development Institute (NFRDI) and Program for Collection, Management and Utilization of Biological Resources from the Ministry of Science, ICT & Future Planning (MSIP) of the Republic of Korea. We are grateful to Prof. Jin-Woo Bae for kindly providing Ruegeria conchae TW15T.

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Correspondence to Jung-Hoon Yoon.

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Kim, YO., Park, S., Nam, BH. et al. Ruegeria meonggei sp. nov., an alphaproteobacterium isolated from ascidian Halocynthia roretzi . Antonie van Leeuwenhoek 105, 551–558 (2014). https://doi.org/10.1007/s10482-013-0107-y

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