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Effects of Mg 2 + , pH and temperature on the electron flow between two photosystems were studied in bean chloroplasts by monitoring the kinetics and extent of the EPR signal from P-700 + . Addition of MgCl 2 can influence the rate of electron transfer due to: (i) stimulation of the photochemical activity of PS II, and (ii) acceleration of plastoquinone reduction and its diffusion from PS II and PS I. The overall rate of electron transfer between two photosystems depends on the rate of plastoquinol oxidation and the sensitivity of this oxidation to the pH in the bulk phase of the thylakoid lumen.
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Тихонов et al. (1984) studied this question.
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