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Abstract

Two bacterial isolates from the Baltic Sea, BA1 and BA134, were characterized for their physiological and biochemical features, fatty acid profiles and phylogenetic position based on 16S rRNA gene sequences. The strains were isolated from surface water of the central Baltic Sea during the decay of a plankton bloom. Phylogenetic analysis of their 16S rRNA gene sequences revealed a clear affiliation to the family ‘’ and showed highest sequence similarity (91 %) to . The G+C content of the DNA was 35·4 mol%. The strains were pink-coloured due to carotinoids, Gram-negative, rod-shaped and catalase- and oxidase-positive. Growth was observed at 0–6 % salinity, with good growth at 0–3 %. Temperature for growth was 4–37 °C, with an optimum around 25 °C. The fatty acid profiles were dominated by branched-chain fatty acids (70 %), with a high abundance of iso-C (29–33 %), iso-C 9 (7–10 %) and C 6 (5–10 %). According to their morphology, physiology, fatty acid composition, 16S rRNA gene sequences and DNA–DNA similarity, on one hand, the described bacteria are considered to be members of the same novel species; on the other hand, they are suggested as a novel genus of the family ‘’. To honour the late aquatic microbiologist Russell T. Bell, the name gen. nov, sp. nov. is suggested for the Baltic Sea isolates, for which the type strain is BA134 (=DSM 15883=LMG 21964=CIP 108006).

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2004-01-01
2020-01-25
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Cells of strain BA134 as visualized by phase-contrast microscopy (bar, 2 µm). Cells are shown in the exponential-growth phase in half-strength marine broth.

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