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Plant Physiology 44:1511-1514 (1969)
© 1969 American Society of Plant Biologists

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Effect of Pyrophosphate on Photosynthetic Electron Transport Reactions

Giorgio Forti and Emilia Maria Meyer

a Laboratory of Plant Physiology, Istituto Botanico dell'Universita Via Amendola 175, Bari, Italy

Inorganic pyrophosphate is found to inhibit the ferredoxin-dependent photoreduction of NADP by isolated chloroplasts. The reduction of ferricyanide is not inhibited, nor is the activity of photosystem 1 as measured with methyl viologen as the electron acceptor. All other ferredoxin-depended reactions are inhibited, such as cytochrome c photoreduction and the reaction sequence: NADPH ->Flavoprotein->ferredoxin->cytochrome c. The inhibition by pyrophosphate is, in all cases, competitive with ferredoxin and independent of NADP concentration. Pyrophosphate inhibition of the formation of the ferredoxin-flavoprotein complex is demonstrated spectrophotometrically.




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J. A. Bassham
The Control of Photosynthetic Carbon Metabolism
Science, May 7, 1971; 172(3983): 526 - 534.
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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1969 by the American Society of Plant Biologists