[EPR study of electron transport in higher plant photosynthetic systems. I. Effect of illumination prehistory on the kinetics of photoinduced oxidation-reduction transformations of P700].

After the adaptation of leaves to darkness (2--4 min) the kinetics of the initiation of ESR I signal aquires a multiphase character: after an initial leap the stage of slower growth sets in. The "memory" of the system about the effect of light of 600 nm, which was realized as a delay of the growth of the ESR I signal under the effect of light of 707 nm, was preserved in the darkness for several minutes. If the light of 600 nm is switched on at the background of the light of 707 nm not earlier than 2-4 min after its switching off in the preceding cycle, unmonotonous transitional process with an overleap is observed.