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Photo phosphorylation and electron transport in chloroplasts of pea plants grown at different light intensities

Photo phosphorylation and electron transport in chloroplasts of pea plants grown at different light intensities

Fiziologiya Rastenii 23(5): 869-876

ISSN/ISBN: 0038-5719

The effect of light intensity on photochemical reactions of isolated chloroplasts was studied during growth of peas. The rate of reduction of the acceptors was higher in chloroplasts of plants grown at a higher intensity of light, the difference being more pronounced during reduction of NADP+ than ferricyanide or methylviologen. Minor differences were detected between the values of P/2e during reduction of the 2 latter acceptors by chloroplasts of plants grown at light intensities of 20 and 80 W/m2. The value of P/2e was almost twice as high during reduction of NADP+ by chloroplasts of shadow plants. Possible factors causing this phenomenon are discussed. Changes in the rate of cyclic phosphorylation, and differences in isolating properties of thylakoid membranes, were not important. Changes in the electron transport chain, caused by different light intensities during growth of plants, were found to be located at P 700-NADP+.

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Accession: 006109019

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