Abstract

The slow decay of the delayed fluorescence (DF) of living plants seems to have a complicated kinetics. A system of differential equations is derived, which takes into account that DF results from a recombination of electrons at the oxidized reaction-center P680 of Photosystem II (PS II). We use a resistor-accumulator (capacitor) equivalent-circuit to describe the Z-scheme. The main characteristic of the model is that the electron-pools of the transport-chain of PS I and PS II are coupled in series by the plastoquinon-molecules.

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