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Chlorophyll a fluorescence is a non-invasive tool widely used in photosynthesis research. According to the dominant interpretation, based on the model proposed by Duysens and Sweers (1963, Special Issue of Plant and Cell Physiology, pp 353–372), the fluorescence changes reflect primarily changes in the redox state of QA, the primary quinone electron acceptor of photosystem II (PSII). While it is clearly...
Experiments were carried out to identify a process co-determining with Q A the fluorescence rise between F 0 and F M . With 3-(3′,4′-dichlorophenyl)-1,1-dimethylurea (DCMU), the fluorescence rise is sigmoidal, in its absence it is not. Lowering the temperature to −10°C the sigmoidicity is lost. It is shown that the sigmoidicity is due to the kinetic overlap between the reduction...
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