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Jannaschia helgolandensis gen. nov., sp. nov., a novel abundant member of the marine Roseobacter clade from the North Sea

Irene Wagner-Döbler¹, Holger Rheims^1,, Andreas Felske¹, Rüdiger Pukall² and Brian J. Tindall²

¹ GBF – Gesellschaft für Biotechnologische Forschung, Mascheroder Weg 1, D-38124 Braunschweig, Germany
² DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen, Mascheroder Weg 1b, D-38124 Braunschweig, Germany

Correspondence
Irene Wagner-Döbler
iwd{at}gbf.de

Heterotrophic bacteria were isolated from a water sample taken from the North Sea, 2 km off the coast of the island of Helgoland, by direct plating of the serially diluted sample on complex marine media. Sixteen of 80 strains from the highest sample dilution belonged to the ‘Roseobacter–Sulfitobacter–Silicibacter’ group within the -subclass of the Proteobacteria on the basis of partial 16S rDNA sequence analysis. Phylogenetic analysis of nearly complete 16S rDNA sequences showed that the closest relative of two strains, Hel 10^T and Hel 26, was Ketogulonicigenium vulgare (94·4 % similarity). These strains were Gram-negative, non-motile rods, obligate aerobes, required sodium ions and 1–7 % sea salts for growth and did not produce bacteriochlorophyll. Their optimal growth temperature was 25–30 °C. The strains had Q-10 as the dominant respiratory quinone. Chemotaxonomic analysis showed a combination of ester-linked 3-OH 10 : 0, 12 : 1 and amide-linked 3-oxo 14 : 0 (or 3-OH 14 : 1) and 3-OH 14 : 0 fatty acids, which appears to be a unique feature of strains Hel 10^T and Hel 26 within this subsection of the -subclass of the Proteobacteria. Based on 16S rDNA sequence analysis and chemotaxonomic data, the strains are assigned to a new genus and species, Jannaschia helgolandensis gen. nov., sp. nov., with the type strain Hel 10^T (=DSM 14858^T=NCIMB 13941^T).

The EMBL accession number for the 16S rDNA sequence of strain Hel 10^T is AJ438157.

Two-dimensional thin-layer chromatograms of polar lipids of strains Hel 10^T and Hel 26 are available as supplementary material in IJSEM Online.

Present address: Bayer AG, D-51368 Leverkusen, Germany.

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