Effect of linolenate on photosynthesis by intact spinach chloroplasts II. Influence of preillumination of leaves on the inhibition of photosynthesis by linolenate

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The inhibitory effect of linolenate on intact spinach chloroplasts depends on the level of the internal pool of metabolites. Chloroplasts from preilluminated leaves or chloroplasts artificially loaded with 3-phosphoglyceric acid required higher concentrations of orthophosphate for maximal rates of CO_2-dependent O_2 evolution than untreated chloroplasts. The loaded chloroplasts were more sensitive to linolenate, and in the presence of linolenate the optimal phosphate concentration was shifted toward lower values. We propose that the inhibition of photosynthesis by linolenate is due to inhibition of the "phosphate translocator".
日本植物生理学会の論文