A mathematical model of phytochrome - the receptor of photomorphogenetic processes in plants.

A mathematical model of the phytochrome pigment system is considered, the parameters of which are determined by solving the problem of identification on the basis of the dynamic characteristics of the photoreceptor obtained experimentally. The model is based on two photochemical and four dark reactions occurring in the phytochrome system. A study of the model permitted establishing the dynamics of processes in the photoreceptor and determining the relation between the behavior of the active form of phytochrome and the intensity and spectral distribution of light. The results of the investigation allows explaining of the high-energy reaction of photomorphogenesis as a consequence of the dynamics of phytochrome processes.