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1Laboratoire de Physiologie des Invertebrés/DRV, IFREMER, Centre de Brest, BP 70, 29280 Plouzané, France
2CNRS, Station Biologique de Roscoff, 29680 Roscoff, France
Author for correspondence: C. Ruiz-Ponte. e-mail: bnclara{at}usc.es
ABSTRACT
Four bacterial strains were isolated from larval cultures and collectors of the scallop Pecten maximus. They showed a high level of intragroup genomic relatedness (84–95%) as determined by DNA-DNA hybridization. The cells were Gram-negative, strictly aerobic, motile, ovoid rods. They grew at temperatures from 15 to 37 °C and from pH 7·0 to 10, but did not grow in the absence of NaCl and required growth factors. They had the ability to use a wide variety of compounds as sole carbon source: D-mannose, D-galactose, D-fructose, D-glucose, D-xylose, melibiose, trehalose, maltose, cellobiose, sucrose, meso-erythritol, D-mannitol, glycerol, D-sorbitol, meso-inositol, succinate, propionate, butyrate, 
-aminobutyrate, DL-hydroxybutyrate, 2-ketoglutarate, pyruvate, fumarate, glycine, L-
-alanine, β-alanine, L-glutamate, L-arginine, L-lysine, L-ornithine and L-proline. They exhibited oxidase and catalase activities but no denitrification activity. The isolates did not contain bacteriochlorophyll a. The G+C content ranged from 57·6 to 58 mol%. Phylogenetic analyses of the 16S rRNA sequence revealed that these isolates belong to the genus Roseobacter. On the basis of quantitative hybridization data, it is proposed that these isolates should be placed in a new species, Roseobacter gallaeciensis. The type strain is Roseobacter gallaeciensis BS107T(= CIP 105210T).
Key Words: Roseobacter gallaeciensis sp. nov. • marine bacterium • scallop • Pecten maximus
The EMBL accession number for the sequence reported in this paper is Y13244.
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