Abstract
A new halophilic species is described that was isolated from the hypersaline (>20%) surface sediments of Great Salt Lake, Utah, via transfer from MPN end-dilution tubes that contained a complex organic medium. The organism was an obligate anaerobe that proliferated optimally at approximately 13% salt, but did not grow significantly at <2% or ≥30% salt. It stained Gram-negative, was nonmotile, nonsporing, and contained an outer-wall membranous layer. The complex lipids of the organism were fatty acid esters that did not change dramatically during growth at 5% or 25% NaCl. The DNA base composition was 27.0±1 mol% guanosine plus cytosine. The temperature range for growth was >5°C and <60°C, the pH range was between 6.0 and 9.0. The doubling time for growth in complex medium with 25% NaCl was 7 h. The organism utilized carbohydrates, peptides, and amino acids. Butyrate, acetate, propionate. H2, and CO2 were the major fermentation end products formed. Glucose, mannose, fructose,n-acetyl glucosamine, and pectin were used as energy sources for growth. Methylmercaptan was produced from methionine degradation. The nameHaloanaerobium praevalens gen. nov. sp. nov. is proposed for the type strain GSL which has been deposited as DSM 2228. The taxonomic relationships ofH. praevalens to other obligate halophiles and anaerobes, as well as its biological role in the Great Salt Lake microbial ecosystem, are discussed.
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Zeikus, J.G., Hegge, P.W., Thompson, T.E. et al. Isolation and description ofHaloanaerobium praevalens gen. nov. and sp. nov., an obligately anaerobic halophile common to Great Salt Lake sediments. Current Microbiology 9, 225–233 (1983). https://doi.org/10.1007/BF01567586
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DOI: https://doi.org/10.1007/BF01567586