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Plant Physiology 71:712-715 (1983)
© 1983 American Society of Plant Biologists

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Articles

Inhibition of Coral and Algal Photosynthesis by Ca2+-Antagonist Phenothiazine Drugs 1

John E. Burris and Clanton C. Black, Jr.

Department of Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, Department of Biochemistry, University of Georgia, Athens, Georgia 30602

The effects of various calcium ion antagonists and ion transport inhibitors on photosynthetic O2 evolution of corals, isolated zooxanthellae, sea anemone tentacles, and Chlorococcum oleofaciens were measured. Only the phenothiazine drugs were effective at inhibiting photosynthesis. Trifluoperazine, a calcium ion antagonist drug, inhibited at low concentrations, with 10–4 molar and 8 x 10–6 molar completely abolishing photosynthesis in the intact corals and isolated zooxanthellae, respectively. Net photosynthetic O2 evolution of C. oleofaciens was eliminated by concentrations of trifluoperazine as low as 2.8 x 10–5 molar.

1 Supported by the National Science Foundation grant PCM 79-18796 to J. E. B. Contribution No. 218 from the Department of Biology, The Pennsylvania State University, University Park, PA 16802. This work also was supported partially by National Science Foundation grant PCM 8023949 to C. C. B.






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Copyright © 1983 by the American Society of Plant Biologists