[Kinetics of photoinduced oxidative-reductive transformation of the reaction center P700 in leaves of C3- and C4-plants].
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.
Bishniakova
E A
EA
Physical Department, Lomonosov Moscow State University, Vorob'evy Gory, Russia.
Trubitsin
B V
BV
Tikhonov
A N
AN
D004578:Electron Spin Resonance Spectroscopy; D007700:Kinetics; D008027:Light; D010084:Oxidation-Reduction; D045322:Photosynthetic Reaction Center Complex Proteins / Q000378:metabolism / Q000528:radiation effects*; D045331:Photosystem I Protein Complex; D018515:Plant Leaves / Q000201:enzymology / Q000378:metabolism*
D045322:Photosynthetic Reaction Center Complex Proteins; D045331:Photosystem I Protein Complex