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Jannaschia cystaugens sp. nov., an Alexandrium (Dinophyceae) cyst formation-promoting bacterium from Hiroshima Bay, Japan

¹ Laboratory of Aquatic Environmental Science, Faculty of Agriculture, Kochi University, Kochi 783-8502, Japan
² Department of Molecular and Cellular Biology, Kochi Medical School, Kochi 783-8505, Japan

Correspondence
Masao Adachi
madachi{at}cc.kochi-u.ac.jp

Heterotrophic bacteria isolated from water samples taken from Hiroshima Bay, Japan, and referred to as Alexandrium (Dinophyceae) cyst formation-promoting bacteria, were assigned to the Roseobacter–Sulfitobacter–Silicibacter group within the -Proteobacteria on the basis of nearly complete 16S rRNA gene sequences. Phylogenetic analyses showed that two strains, CFPB-A9^T and CFPB-A5, are closely related to each other and that their closest relative was Jannaschia helgolandensis (95·9 % sequence similarity). These strains were Gram-negative, motile, obligately aerobic rods that required sodium ions and 2–7 % sea salts for growth and did not produce bacteriochlorophyll a. Their optimal growth temperature was 25–30 °C. The strains had Q-10 as the dominant respiratory quinone. Primary cellular fatty acid in both strains was 18 : 17c. The DNA G+C contents of strains CFPB-A9^T and CFPB-A5 were 59·1 and 59·2 mol%, respectively. Based on physiological, biological, chemotaxonomic and phylogenetic data, the strains are considered to represent a novel species, Jannaschia cystaugens sp. nov., with type strain CFPB-A9^T (=LMG 22015^T=NBRC 100362^T).

Published online ahead of print on 13 April 2004 as DOI 10.1099/ijs.0.03029-0.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of Jannaschia cystaugens CFPB-A9^T and CFPB-A5 are AB121782 and AB121783, respectively.

Fatty acid profiles for strains CFPB-A9^T and CFPB-A5 are available as supplementary material in IJSEM Online.

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