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  • Title: [Kinetics of photoinduced oxidative-reductive transformation of the reaction center P700 in leaves of C3- and C4-plants].
    Author: Bishniakova EA, Trubitsin BV, Tikhonov AN.
    Journal: Biofizika; 2000; 45(5):899-904. PubMed ID: 11094720.
    Abstract:
    The light-induced changes in the kinetics of the oxidation of photosystem I reaction center P700 in leaves of C3 and C4 plants, depending on the time of leaf adaptation to dark before the illumination were studied. The EPR 1 signal from oxidized centers P+700 was used to monitor the kinetics of P700 redox transients. Similar dependences of the light-induced changes in the kinetics of P700 versus the adaptation time were observed in leaves of three kinds of plants: bean, orange and maize. These data suggest that the deactivation of the Calvin cycle enzymes, which occurs 1-3 min after ceasing the illumination, is the main factor that causes the retardation of the light-induced oxidation of P700.
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