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Maribius salinus gen. nov., sp. nov., isolated from a solar saltern and Maribius pelagius sp. nov., cultured from the Sargasso Sea, belonging to the Roseobacter clade

Dong H. Choi^1,,, Jang-Cheon Cho^2,, Brian D. Lanoil³, Stephen J. Giovannoni⁴ and Byung C. Cho¹

¹ School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, Seoul 151-742, Republic of Korea
² Division of Life and Marine Sciences, Inha University, Incheon 402-751, Republic of Korea
³ Department of Environmental Sciences, University of California, Riverside, CA 92521, USA
⁴ Department of Microbiology, Oregon State University, Corvallis, OR 97331, USA

Correspondence
Byung C. Cho
bccho{at}snu.ac.kr

Two strictly aerobic, Gram-negative bacteria, designated strains CL-SP27^T and B5-6^T, were isolated from the hypersaline water of a solar saltern in Korea and from the surface water of the Sargasso Sea, respectively. The two strains were rod-shaped, non-motile and grew on marine agar 2216 as beige colonies. Phylogenetic analyses of 16S rRNA gene sequences revealed a clear affiliation of the novel strains to the family Rhodobacteraceae. However, the novel strains were only distantly related to members of the Roseobacter clade, forming a distinct lineage. Although the 16S rRNA gene sequence similarity between strains CL-SP27^T and B5-6^T was very high (99.6 %), DNA–DNA relatedness between the strains was 48.4 %, suggesting that the strains be categorized as two genospecies. Additionally, the two novel strains could be differentiated by DNA G+C contents, fatty acid profiles, carbon source utilization patterns, antibiotic susceptibilities and biochemical characteristics. Based on taxonomic data obtained in this study, strains CL-SP27^T and B5-6^T represent separate species within a novel genus of the family Rhodobacteraceae, for which the names Maribius salinus gen. nov., sp. nov. (type species) and Maribius pelagius sp. nov. are proposed. The type strains of Maribius salinus and Maribius pelagius are CL-SP27^T (=KCCM 42113^T=JCM 13037^T) and B5-6^T (=KCCM 42336^T=JCM 14009^T), respectively.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strain CL-SP27^T and B5-6^T are AY906863 and DQ514326, respectively.

A table giving the major characteristics that differentiate strains CL-SP27^T and B5-6^T from other related members of the family Rhodobacteraceae is available as supplementary material in IJSEM Online.

These authors contributed equally to this work.

Present address: Marine Environmental Research Department, Korea Ocean Research and Development Institute (KORDI), Ansan 426-744, Republic of Korea.

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