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Plant Physiology 84:649-653 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Inhibition of the Photosynthetic Activities of Isolated Spinach Chloroplasts by Phosphonate Compounds

Bruria Heuer1 and Archie R. Portis, Jr.

Department of Agronomy, University of Illinois, Urbana, Illinois 61801, United States Department of Agriculture, Agricultural Research Service, Urbana, Illinois 61801

The effects of three closely related phosphonate compounds on several photosynthetic activities of isolated chloroplasts were investigated. Phosphonoformic and phosphonopropionic acid were found to inhibit both CO2 fixation and the reduction of 3-phosphoglyceric acid, with CO2 fixation being more sensitive. In contrast, phosphonoacetic acid was only slightly inhibitory. The lack of inhibition appeared to be due to its inability to enter the stroma via the phosphate translocator. Measurements of changes in stromal metabolite levels following the inhibition of CO2 fixation by either phosphonoformic or phosphonopropionic acid indicated that the activity of ribulose bisphosphate carboxylase/oxygenase was reduced. Studies with the isolated enzyme confirmed that both of these compounds were effective competitive inhibitors of the carboxylase activity of the enzyme.

1 On leave from A.R.O., The Volcani Center, Bet Dagan, Israel.






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Copyright © 1987 by the American Society of Plant Biologists