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The isolation and preliminary characterization of a halophilic photosynthetic bacterium

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The isolation of a photosynthetic bacterium which is apparently an obligate halophile is reported. The organism (strain SL-1) grows in a medium with either thiosulfate of sulfide and bicarbonate containing 22% NaCl but not in one containing 4% NaCl. The morphology is abnormal in media with 8% NaCl. Strain SL-1 is an obligate anaerobe. The major carotenoid pigment is spirilloxanthin. The spectrum of the chlorophyllous pigment is very similar to that of bacteriochlorophyll; however, its identity with bacteriochlorophyll has not been demonstrated.

Strain SL-1 is a spirillum. Cells possess a single, polar, sheathed flagellum. The ultrastructure of the cells is depicted.

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Dedicated to Professor C. B. van Niel on the occasion of his 70th birthday.

Supported in part by a grant from the National Science Foundation.

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Raymond, J.C., Sistrom, W.R. The isolation and preliminary characterization of a halophilic photosynthetic bacterium. Archiv. Mikrobiol. 59, 255–268 (1967). https://doi.org/10.1007/BF00406339

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  • Sulfide
  • Bicarbonate
  • Carotenoid
  • Thiosulfate
  • Photosynthetic Bacterium