Predicting the Extent of Photosystem II Photoinactivation Using Chlorophyll a Fluorescence Parameters Measured during Illumination

The temperature dependence of the relationship between the decline in activity of photosystem II (PSII) and a chlorophyll a fluorescence parameter combining the excitation pressure (1–qP) and efficiency of excitation energy capture by open PSII reaction centers in the light-acclimated state (Fv′/Fm′) was investigated in cotton leaves. A formula for the prediction of PSII inactivation is proposed on the basis of the results obtained. By...