[Primary photoprocesses in light chloroplast fragments].

An attempt has been made to study the mechanism of photoinduced separation of charges and their recombination in reaction centres of the photosystem 1 of the light fragments of chloroplasts. It has been shown, in agreement with recent papers, that the studied properties of electron donor of the photosystem 1 correspond to P700 pigment (with absorption maxima at 430 and 700 nm), the properties of electron acceptor correspond to that of ferredoxin type compound (P430) (with absorption maxima at 420, 444 and 717 nm) and heat stable compound (Px). Accumulation of the charges both for P700+-P430 and P700-P430- has been accompanied by increase of the fluorescence yield and shift of chlorophyll absorption band from 680 nm to approximately 690 nm. The recombination process of P700+ and P430- has been accompanied by the delayed luminescence. The study of kinetics of interaction between chlorophyll excited states and reaction centres and also kinetics of charge recombination and luminescence decay has shown that the primary photoprocesses in the photosystem 1 occur with interaction of several (greater than 3) centres of charge separation (P700-P430).