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Effect of Pyrophosphate on Photosynthetic Electron Transport Reactions

Giorgio Forti and Emilia Maria Meyer
Plant Physiology
Vol. 44, No. 11 (Nov., 1969), pp. 1511-1514
Stable URL: http://www.jstor.org/stable/4261866
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effect of Pyrophosphate on Photosynthetic Electron Transport Reactions
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Abstract

Inorganic pyrophosphate is found to inhibit the ferredoxin-dependent photo-reduction 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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