Mechanism study on the origin of delayed fluorescence by an analytic modeling of the electronic reflux for photosynthetic electron transport chain

A mathematical–physical analysis model, which describes individually the electronic reflux of several significant components in the photosynthesis electron transport chain, was firstly developed. The process of electrons flowing back to the oxidized reaction center P 680 + was simulated by a series...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. B, Biology Biology, 2007-06, Vol.87 (3), p.183-190
Main Authors: Li, Qiang, Xing, Da, Jia, Li, Wang, Junsheng
Format: Article
Language:English
Subjects:
Charge recombination
Decay kinetics
Delayed fluorescence
Electron blockers
Electron Transport
Fluorescence
Kinetics
Mathematical–physical analysis model
Models, Theoretical
Photosynthesis
Photosynthetic Reaction Center Complex Proteins
Plant Leaves
Zea mays
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Summary:A mathematical–physical analysis model, which describes individually the electronic reflux of several significant components in the photosynthesis electron transport chain, was firstly developed. The process of electrons flowing back to the oxidized reaction center P 680 + was simulated by a series of photochemical reaction equations, resulting in getting the linked differential equations of delayed fluorescence (DF) intensity. MATLAB provided a computationally efficient method to solve these linked equations. Simulations based on this model showed that the decay kinetics of DF accord with double exponential. DF components decaying in the millisecond range (fast phase) are related to the charge recombination of P 680 + and Q A - . The components decaying in the seconds range are associated with the recombination of P 680 + with Q B 2 - . The developed model was tested in maize leaves treated with different electron blockers to induce changes in photosynthesis electron transport chain. The experimental results demonstrated that the developed model can accurately determine the regulatory effects of electron blockers on photosynthesis electron transport chain. Therefore, the model presented here could be potentially useful for studying the electron transfer in plant. It also provides an experimental workbench for testing hypotheses as to the underlying mechanism controlling the change for different phases of DF.
ISSN:1011-1344
1873-2682
DOI:10.1016/j.jphotobiol.2007.04.005