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Plant Physiology 49:820-825 (1972)
© 1972 American Society of Plant Biologists

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Inhibition of Photosystem II in Isolated Chloroplasts by Lead 1

C. D. Miles, J. R. Brandle, D. J. Daniel, O. Chu-Der2, P. D. Schnare and D. J. Uhlik

a Division of Biological Sciences, University of Missouri, Columbia, Missouri 65201

Inhibition of photosynthetic electron transport in isolated chloroplasts by lead salts has been demonstrated. Photosystem I activity, as measured by electron transfer from dichlorophenol indophenol to methylviologen, was not reduced by such treatment. However, photosystem II was inhibited by lead salts when electron flow was measured from water to methylviologen and Hill reaction or by chlorophyll fluorescence. Fluorescence induction curves indicated the primary site of inhibition was on the oxidizing side of photosystem II. That this site was between the primary electron donor of photosystem II and the site of water oxidation could be demonstrated by hydroxylamine restoration of normal fluorescence following lead inhibition.

2 Present address: Department of Biophysics, University of Chicago, Chicago, Ill. 60637.

1 A portion of this research represents student contributions in the graduate photosynthesis course.






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Copyright © 1972 by the American Society of Plant Biologists