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A Kinetic Model for Delayed Fluorescence from Plants

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  077003.(doi:10.13031/2013.22957)
Authors:   Ya Guo, Brian J Wirth, Jinglu Tan
Keywords:   Delayed Fluorescence, Electron Transport Chain, Photosynthesis, Modeling

A new kinetic model of delayed fluorescence was developed based on the electron transport process with three state variables, QA-, QB-, and QB2-; fewer than the five state variables (QA-QB, QAQB-, QA-QB-, QAQB2- and QA-QB2- ) used in previous models. Delayed fluorescence in drought-stressed soybean, DCMU-treated corn, and healthy plants was measured with a photon-counting system. The data were used to verify the model through nonlinear least-squares optimization. There were no visible differences between the healthy and the stressed plants. The model showed a significant reduction in the electron generating efficiency in the drought-stressed samples. The model also showed a significant decrease of activated QAQB sites in the DCMU-treated samples, consistent with the mechanism by which DCMU functions. The difference between the experimental and predicted values is about 5%. The results prove that the new model is an effective and reduced model structure for delayed fluorescence from plants.

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