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Applied and Environmental Microbiology, February 2004, p. 736-744, Vol. 70, No. 2
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.2.736-744.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Variation in Sulfide Tolerance of Photosystem II in Phylogenetically Diverse Cyanobacteria from Sulfidic Habitats

Scott R. Miller* and Brad M. Bebout

NASA Ames Research Center, Moffett Field, California 94035

Received 13 June 2003/ Accepted 2 November 2003

Physiological and molecular phylogenetic approaches were used to investigate variation among 12 cyanobacterial strains in their tolerance of sulfide, an inhibitor of oxygenic photosynthesis. Cyanobacteria from sulfidic habitats were found to be phylogenetically diverse and exhibited an approximately 50-fold variation in photosystem II performance in the presence of sulfide. Whereas the degree of tolerance was positively correlated with sulfide levels in the environment, a strain's phenotype could not be predicted from the tolerance of its closest relatives. These observations suggest that sulfide tolerance is a dynamic trait primarily shaped by environmental variation. Despite differences in absolute tolerance, similarities among strains in the effects of sulfide on chlorophyll fluorescence induction indicated a common mode of toxicity. Based on similarities with treatments known to disrupt the oxygen-evolving complex, it was concluded that sulfide toxicity resulted from inhibition of the donor side of photosystem II.

* Corresponding author. Present address: Division of Biological Sciences, The University of Montana, 32 Campus Dr. #4824, Missoula, MT 59812-4824. Phone: (406) 243-5149. Fax: (406) 243-4184. E-mail: scott.miller{at}mso.umt.edu.

Applied and Environmental Microbiology, February 2004, p. 736-744, Vol. 70, No. 2
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.2.736-744.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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