Kinetic model of photosystem II of higher green plants

Based on up-to-date physicochemical data, a complete kinetic model of the c atalytic cycle of photosystem II (PS II) for higher green plants was constr ucted. In compliance with the time hierarchy of photosynthetic stages, the model was reduced in order to describe only processes occurring on the mill isecond time scale. In terms of the model, chlorophyll fluorescence inducti on curves at different values of model parameters were calculated. The fluo rescence intensity was determined from an equation for calculating the conc entrations of PS II fluorescence states and their dependence on the compone nts of the electrochemical potential across the tylacoid membrane. The prop osed model, which considers only processes occurring within PS II, cannot d escribe some features of the ascending branch of the chlorophyll fluorescen ce induction curve. It was found that the steady-state level of the fluores cence intensity may nonmonotonically depend on the transmembrane electric p otential.