MATHEMATICAL-MODELING OF CHANGES IN CHLOROPHYLL FLUORESCENCE INDUCTION CAUSED BY HERBICIDES

Chlorophyll fluorescence induction curves of cereal leaves measured du ring herbicide action were simulated by a mathematical model based on description of electron transfer through photosystem II to a plastoqui none pool. To obtain results comparable with experimental measurements , we considered three kinds of photosystem II centers: Q(B)-reducing, Q(B)-nonreducing, and inactive centers. We compared the parameters cal culated using mathematical simulations with experimental parameters ob tained with barley and wheat leaves treated with triazine-and urea-typ e herbicides. A good agreement between simulated and experimental para meters was found. (C) 1997 Academic Press.