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Sulfitobacter delicatus sp. nov. and Sulfitobacter dubius sp. nov., respectively from a starfish (Stellaster equestris) and sea grass (Zostera marina)

¹ Pacific Institute of Bioorganic Chemistry of the Far-Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Pr. 100 Let Vladivostoku 159, Russia
² Industrial Research Institute, Swinburne University of Technology, PO Box 218, Hawthorn, Vic 3122, Australia
³ Laboratory of Microbiology, Graduate School of Fisheries Sciences, Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, Hakodate 041-8611, Japan
⁴ Institute of Marine Biology of the Far-Eastern Branch of the Russian Academy of Sciences, 690041 Vladivostok, Russia
⁵ Muscle Research Unit, Institute for Biomedical Research, The University of Sydney, Sydney 2006, Australia
⁶ UMR 6543 CNRS and Université de Nice Sophia Antipolis, Centre de Biochimie, Parc Valrose, F-06108 Nice cedex 2, France

Correspondence
Elena P. Ivanova
eivanova{at}swin.edu.au

On the basis of data from phenotypic and genotypic characterization and analysis of 16S rRNA gene sequences, two novel species belonging to the genus Sulfitobacter are described. Strains KMM 3584^T, a pale-yellowish, non-motile strain isolated from a starfish (Stellaster equestris), and KMM 3554^T, which is motile by means of a single subpolar flagellum and was isolated from sea grass (Zostera marina), are marine, Gram-negative, aerobic, rod-shaped organisms. Both strains have the ability to degrade gelatin, but not casein, chitin, agar, DNA, Tween 80 or starch. Strain KMM 3584^T decomposed alginate and grew at NaCl concentrations of 1–8 % and temperatures of 12–37 °C, whereas strain KMM 3554^T grew in 1–12 % NaCl and at temperatures of 10–30 °C. The predominant fatty acid was 18 : 17, amounting to up to 80 % of the total fatty acids. The other characteristic feature was the presence of 18 : 2 isomers. The DNA G+C contents of KMM 3584^T and KMM 3554^T were respectively 60·0 and 63·7 mol%. The level of DNA similarity between the two strains was 33 %. DNA from KMM 3584^T and KMM 3554^T had hybridization values of 5–24 % and 10–41 %, respectively, with DNA from the type strains of Sulfitobacter pontiacus, Sulfitobacter brevis, Sulfitobacter mediterraneus and Staleya guttiformis. It is proposed that strains KMM 3584^T (=LMG 20554^T=ATCC BAA-321^T) and KMM 3554^T (=LMG 20555^T=ATCC BAA-320^T) represent two novel species, Sulfitobacter delicatus sp. nov. and Sulfitobacter dubius sp. nov., respectively.

Published online ahead of print on 18 September 2003 as DOI 10.1099/ijs.0.02654-0.

The GenBank accession numbers for the 16S rRNA gene sequences of KMM 3584^T and KMM 3554^T are AY180103 and AY180102.

Electron micrographs of negatively stained cells of KMM 3554^T, a similarity matrix table and an extended phylogenetic tree are available as supplementary material in IJSEM Online.

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