Kinetic models of photosystem II should accommodate the effect of donor side quenching on variable chlorophyll A fluorescence in the microseconds time range.
Quantitative data on laser flash-induced variable fluorescence in the 100 ns to 1 ms time range (Belyaeva et al. in Photosynth Res 98:105-119, 2008) confirming those of others (Steffen et al. in Biochemistry 40:173-180, 2001, Biochemistry 44:3123-3132, 2005; Belyaeva et al. in Biophysics 51(6):976-990, 2006), need a substantial correction with respect to magnitude of the normalized variable fluorescence associated with single turnover-induced charge separation in RCs of PS II. Their data are conclusive with the involvement of donor side quenching, the release of which occurs with a rate constant in the range of tens of ms(-1), and presumed to be associated with reduction of Y(+)(z) by the OEC.
Vredenberg
Wim J
WJ
D000222:Adaptation, Physiological; D017360:Arabidopsis / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism*; D000077194:Chlorophyll A; D003624:Darkness; D005453:Fluorescence; D007700:Kinetics; D008954:Models, Biological; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D013997:Time Factors
D045332:Photosystem II Protein Complex; D002734:Chlorophyll; D000077194:Chlorophyll A