Archives of Microbiology

, Volume 130, Issue 3, pp 238–242 | Cite as

Ectothiorhodospira vacuolata sp. nov., a new phototrophic bacterium from soda lakes

  • Johannes F. Imhoff
  • Brian J. Tindall
  • William D. Grant
  • Hans G. Trüper


A new phototrophic bacterium was isolated from Jordanian and Kenyan alkaline salt lakes. Cells are rod shaped, 1.5 μm wide and 2–4 μm long, and motile by polar flagella. They divide by binary fission, and possess photosynthetic membranes as lamellar stacks similar to those in the other species of the genus Ectothiorhodospira and the brown colored Rhodospirillum species. The presence of bacteriochlorophyll a and carotenoids of the normal spirilloxanthin series is indicated by the absorption spectra of living cells. Under certain growth conditions the cells form gas vacuoles, may become immotile and float to the top of the culture medium. Sulfide and thiosulfate are used as photosynthetic electron donors. During the oxidation of sulfide to sulfate, elemental sulfur is formed, which is accumulated outside the cells. The organisms are strictly anaerobic, do not require vitamins, are moderately halophilic and need alkaline pH-values for growth. The new species Ectothiorhodospira vacuolata is proposed.

Key words

Phototrophic bacteria Ectothiorhodospira vacuolata Gas vacuoles Alkaliphilic bacteria Halophilic bacteria Anaerobic sulfide oxidation 


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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • Johannes F. Imhoff
    • 1
  • Brian J. Tindall
    • 2
  • William D. Grant
    • 2
  • Hans G. Trüper
    • 1
  1. 1.Institut für MikrobiologieRheinische Friedrich-Wilhelms-UniversitätBonn 1Federal Republic of Germany
  2. 2.Department of MicrobiologyUniversity of LeicesterLeicesterUK

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