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Volume 53, Issue 2

sp. nov., a marine bacterium with a high optimum growth temperature isolated from surface water of the central Baltic Sea Free

Abstract

Two bacterial strains isolated from the Baltic Sea, OS145 and OS146, were characterized on the basis of their physiological and biochemical features, their fatty acid profiles and their phylogenetic position based on 16S rDNA sequence analyses. The strains were isolated from the upper oxic water column of the central Baltic Sea. Phylogenetic analyses of the 16S rDNA gene sequences revealed a clear affiliation of the novel strains with members of the genus , of the . Closest sequence similarity was seen with and (95–96 %). The mean G+C content of the DNA of strains OS145 and OS146 was 49·7 mol%. Both strains were non-pigmented, Gram-negative, polarly flagellated organisms that were strictly aerobic. Growth of the strains was observed at salinities ranging from 0·8 to 10 % NaCl. Temperature range for growth was rather broad and high for marine bacteria: both strains grew between 8 and 46 °C, showed good growth between 20 and 44 °C, and had an optimum between 30 and 40 °C. The fatty acids of the two strains were dominated by iso-branched fatty acids (54–80 %), with a high abundance of C (36 %), C, C and C. Growth temperature (8–40 °C) influenced the fatty acid composition of the strains in a way that the content of iso-branching fatty acids increased with increasing temperatures, while the mono-unsaturated fatty acids increased with decreasing temperatures. Salinity (1·7–10 % NaCl) had only a minor effect on the fatty acid composition. According to their morphology, physiology, fatty acid composition and 16S rDNA sequences, strains OS145 and OS146 fitted well into the genus , but could be easily distinguished from the recognized species of the genus. Because of their unique nature, it is proposed that the strains isolated from the Baltic Sea represent a novel species, for which the name (type strain OS145=DSM 15154 =LMG 21691) is proposed.

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2003-03-01
2024-04-18
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Idiomarina baltica sp. nov., a marine bacterium with a high optimum growth temperature isolated from surface water of the central Baltic Sea
Int J Syst Evol Microbiol 53, 407 (2003); https://doi.org/10.1099/ijs.0.02399-0
/content/journal/ijsem/10.1099/ijs.0.02399-0
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