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Effect of linolenate on photosynthesis by intact spinach chloroplasts I. Inhibition of orthophosphate uptake and of 3-P-glyceraldehyde efflux across the chloroplast envelope

Siegenthaler, Paul-Andreé ; Akamba, Lambert Mveé

In: Plant and Cell Physiology, 1979, vol. 20, no. 2, p. 395-404

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    Titre
    • Effect of linolenate on photosynthesis by intact spinach chloroplasts I. Inhibition of orthophosphate uptake and of 3-P-glyceraldehyde efflux across the chloroplast envelope
    Auteur
    • Siegenthaler, Paul-Andreé. Laboratoire de Physiologie végétale et Biochimie, Université de Neuchâtel, 20, rue de Chantemerle, 2000 Neuchâtel, Switzerland
    • Akamba, Lambert Mveé. Laboratoire de Physiologie végétale et Biochimie, Université de Neuchâtel, 20, rue de Chantemerle, 2000 Neuchâtel, Switzerland
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:289301
    Summary
    Linolenic acid (C18:3) inhibited photosynthesis by intact spinach chloroplasts. This inhibition was due neither to a lack of NADPH in chloroplasts nor to a direct inhibition of the enzyme activities in the Calvin-Benson cycle. Linolenate inhibited CO2 fixation and oxygen evolution more effectively than NADP+ photoreduction but did not inhibit the activity of several key enzymes of the Calvin cycle. Linolenate inhibited phosphate influx and 3-phosphoglyceraldehyde efflux across the chloroplast envelope. A hypothesis explaining the inhibition of photosynthesis by linolenate is presented