1887

Abstract

A rod-shaped, 15–30 μm long, red bacterium, affiliated phylogenetically with the phylum , was isolated from an experimental mesocosm at Sedom, Israel, filled with a mixture of water from the Dead Sea and the Red Sea. The organism stains Gram-negative and is obligately aerobic, heterotrophic and oxidase- and catalase-positive. Growth is obtained in the presence of 5–20 % NaCl, with an optimum at 10 % NaCl plus 5 % MgCl . 6HO. Temperature and pH optima are 37–46 °C and pH 6.5–8.5. Nitrate is not reduced. Glucose, sucrose, maltose and glycerol stimulate growth with acid formation; no growth stimulation is obtained in the presence of fructose, ribose, xylose, mannitol or sorbitol. The G+C content of the DNA is 62.9 mol% (HPLC). Main fatty acids are 16 : 0 iso and 16 : 1 9, followed by 15 : 0 iso and 15 : 0 anteiso. The isolate is sufficiently different from its closest relatives to be classified within a novel species belonging to a new genus, for which we propose the name gen. nov., sp. nov. The type strain of is strain S4-4 (=DSM 21114 =CECT 7354).

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2009-10-01
2020-09-30
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vol. , part 10, pp. 2571 - 2574

One-dimensional (left panel) and two-dimensional (right panel) chromatograms of polar lipids extracted from strain S4-4 . In the one-dimensional chromatogram, M31 was included for comparison. Solvents used were chloroform/methanol/acetic acid/water (85:22.5:10:4 by vol.) (one-dimensional chromatogram) and chloroform/methanol/water (65:25:4 by vol.) (first dimension of two-dimensional chromatogram) and chloroform/methanol/acetic acid/water (80:12:15:4 by vol.) (second dimension). P, Phospholipid; G, glycolipid; N, amino-group-containing lipid (ninhydrin-positive).



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