Novel halophilic aerobic anoxygenic phototrophs from a Canadian hypersaline spring system |
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Authors: | Julius T Csotonyi Jolantha Swiderski Erko Stackebrandt Vladimir V Yurkov |
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Institution: | Department of Microbiology, University of Manitoba, 418 Buller Building, R3T 2N2, Winnipeg, MB, Canada. |
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Abstract: | The first enumeration of cultivable obligately aerobic phototrophic bacteria from a terrestrial saline spring was accomplished in the East German Creek system (salinity approximately 6%), near Lake Winnipegosis, Manitoba, Canada. Occurring at densities up to 3.3 x 10(7) CFU/ml of sample, aerobic phototrophs comprised 15-36% of the total cultivable bacterial population in the diatom- and chlorophyte-dominated aerobic microbial mats. Many of the representative strains isolated for phenotypic characterization and phylogenetic analysis possessed <96% 16S rDNA sequence overlap with published species, including an obligately aerobic phototrophic gammaproteobacterium displaying only 92.9% 16S rDNA sequence similarity to Congregibacter litoralis. The springs yielded the most highly halotolerant aerobic anoxygenic phototroph yet recorded, strain EG11, which grew with 26% NaCl. |
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Keywords: | Aerobic anoxygenic phototrophs Phototrophic halophiles Hypersaline springs Bacteriochlorophyll Physiology |
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