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Plant and Cell Physiology, 2003, Vol. 44, No. 10 1064-1070
© 2003 Oxford University Press

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

Dmytro Kornyeyev1,3, Scott Holaday1 and Barry Logan2,4

1 Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409-3131, U.S.A.
2 Biology Department, Bowdoin College, Brunswick, ME 04011, U.S.A.
3 Institute of Plant Physiology and Genetics, Kyiv 03022, Ukraine

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.

4 Corresponding author: E-mail, blogan{at}bowdoin.edu; Fax, +1-207-725-3405.


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