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Plant Physiology 82:488-493 (1986)
© 1986 American Society of Plant Biologists

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Articles

Effects of Arsenite, Sulfite, and Sulfate on Photosynthetic Carbon Metabolism in Isolated Pea (Pisum sativum L., cv Little Marvel) Chloroplasts 1

Ivano A. Marques2 and Louise E. Anderson

Department of Biological Sciences, University of Illinois at Chicago, Box 4348, Chicago, Illinois 60680

Photosynthetic CO2-fixation in isolated pea (Pisum sativum L., cv Little Marvel) chloroplasts during induction is markedly inhibited by 0.4 millimolar sulfite. Sulfate at the same concentration has almost no effect. The 14CO2-fixation pattern indicates that the primary effect of sulfite is inhibition of the reaction catalyzed by ribulose bisphosphate carboxylase and a stimulation of export of intermediates out of the chloroplasts. Inhibition of light modulation of stromal enzyme activity does not appear to account for the toxicity of SO2 in this Pisum variety. Arsenite at 0.2 millimolar concentrations inhibits light activation and inhibits photosynthetic CO2 fixation. The 14CO2-fixation pattern indicates that the primary effect of arsenite is inhibition of light activation of reductive pentose phosphate pathway enzyme activity.

2 Present address: Institute of Biotechnology, Swiss Federal Institute of Technology, Hönggerberg, CH-8093 Zurich, Switzerland.

1 Supported by United States Department of Energy Grant 85ER60367.






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Copyright © 1986 by the American Society of Plant Biologists