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 comparison of the predicted and actual levels of PSII photoinactivation, the rate of PSII recovery was estimated from chlorophyll a fluorescence parameters measured during the day for attached cotton leaves exposed to suboptimal morning temperatures in a greenhouse.
Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409-3131, USA.
Dmytro
D
Kornyeyev
Scott
S
Holaday
Barry
B
Logan
D000064:Acclimatization; D003368:Gossypium / Q000502:physiology* / Q000528:radiation effects; D008027:Light; D008856:Microscopy, Fluorescence; D010507:Periodicity; D045322:Photosynthetic Reaction Center Complex Proteins / Q000528:radiation effects*; D018515:Plant Leaves / Q000502:physiology / Q000528:radiation effects; D013696:Temperature
D045322:Photosynthetic Reaction Center Complex Proteins