Archiv für Mikrobiologie

, Volume 86, Issue 1, pp 49–56 | Cite as

Sulfide utilization by purple nonsulfur bacteria

  • Theo A. Hansen
  • Hans van Gemerden
Article

Summary

The purple nonsulfur bacteria Rhodospirillum rubrum SMG 107, Rhodopseudomonas capsulata SMG 155, Rps. sphaeroides SMG 158 and Rps. palustris SMG 124 were tested for a possible utilization of sulfide. The first three strains were found to oxidize sulfide to extracellular elemental sulfur only, whereas Rps. palustris SMG 124 converted sulfide into sulfate without intermediate accumulation of elemental sulfur. Growth ceased at lower sulfide concentrations than usually found with purple sulfur bacteria. In consequence of the low sulfide tolerance information on the specific growth rates obtainable with sulfide as photosynthetic electron donor could not be provided by cultivation in batch cultures. Sulfide-limited chemostat cultures of Rps. capsulata SMG 155 showed that the maximum specific growth rate was close to 0.14 h-1 (doubling time 5 h). Sulfide was converted into extracellular elemental sulfur at all dilution rates tested. The maximum specific growth rate of Rps. palustris SMG 124 was found to be much lower (less than 0.03 h-1). Sulfate was the only product of the conversion of sulfide.

These data show that at least some purple nonsulfur bacteria may play a role in the dissimilatory sulfur cycle in nature. Taxonomic implications of our results are discussed.

Abbreviation

SMG

Sammlung für Mikroorganismen, Göttingen

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Copyright information

© Springer-Verlag 1972

Authors and Affiliations

  • Theo A. Hansen
    • 1
  • Hans van Gemerden
    • 1
  1. 1.Laboratory for MicrobiologyUniversity of GroningenThe Netherlands

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