Abstract
Summary Dissimilatory acetate-oxidizing sulfate-reducing bacteria were enriched from hypersaline sediments of the Great Salt Lake (Utah, USA) in a synthetic medium. Three mesophilic rod-shaped strains were isolated from deep-agar dilution series, and one strain (GSL-Ac1) was chosen for further studies. Strain GSL-Ac1 showed a high degree of salt tolerance (up to 13% NaCl and 4.5% MgCl 2 · 6H 2 O), but displayed optimum growth with only 1–2% NaCl in the medium. 16S rDNA sequencing placed GSL-Acl in the genus Desulfobacter . On the basis of DNA-DNA hybridization studies and physiological differences, we describe strain GSL-Acl as a new species, Desulfobacter halotolerans sp. nov. Strain GSL-Acl showed the highest NaCl-tolerance reported for any member of the genus Desulfobacter .
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