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Int J Syst Evol Microbiol 59 (2009), 1359-1363; DOI  10.1099/ijs.0.65528-0
© 2009 International Union of Microbiological Societies

Sphingomonas aestuarii sp. nov., isolated from tidal flat sediment

Seong Woon Roh1, Kyoung-Ho Kim1, Young-Do Nam1, Ho-Won Chang1, Min-Soo Kim1, Hee-Mock Oh2 and Jin-Woo Bae1

1 Department of Biology, Kyung Hee University, Seoul 130-701, Korea
2 Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-806, Korea.

Correspondence
Jin-Woo Bae
baejw{at}kribb.re.kr

A novel bacterium (strain K4T) belonging to the genus Sphingomonas was isolated from tidal flat sediment in Korea. Its morphology, physiology, biochemical features and 16S rRNA gene sequence were characterized. Colonies of this strain are yellow in colour and the cells are rod-shaped, exhibiting negative Gram staining. The strain grows at 0–5 % (w/v) NaCl and 20–35 °C, with optimal growth occurring at 0 % (w/v) NaCl and 30 °C. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain K4T is associated with the genus Sphingomonas. Within the phylogenetic tree, this novel strain shares a branching point with Sphingomonas asaccharolytica Y-345T, with which it shares 97.3 % 16S rRNA gene sequence similarity. The polyamine pattern predominantly contains the Sphingomonas-specific triamine sym-homospermidine. Combined analysis of 16S rRNA gene sequences, DNA–DNA relatedness, physiological and biochemical test results identified genotypic and phenotypic differences between strain K4T and other Sphingomonas species. On the basis of these differentiating features, it is concluded that strain K4T (=KCTC 22050T=DSM 19475T) represents a novel species of the genus Sphingomonas, for which the name Sphingomonas aestuarii sp. nov. is proposed.

Abbreviations: DPG, diphosphatidylglycerol; PC, phosphatidylcholine; PDE, phosphatidyldimethylethanolamine; PE, phosphatidylethanolamine; PG, phosphatidylglycerol; PL, unknown phospholipid; SGL, sphingoglycolipid

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain K4T is EF660755.






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