Biophysical mechanisms of intracellular signaling (transduction) in higher plants

Abstract

Three fundamental processes running in plant organisms under influence of environment (light, gravity) and key importance were considered. In the light case these are phytоchrome regulation and phototropism considering process is gravitropism. Phytochrome is responsible for regulatory reaction at the inhibition of which the plants cannot be normally developed. The plants do not need phototropism and gravitropism. They were elaborated by evolution as protective reactions to optimize the plant vitality. All these processes are realized according to one and the same logical scheme: stimulus reception, signaling processes in plant cell (transduction) and proper biological effect. According to this scheme the three reactions were considered. As the result the data adout the reception stages are principally different because receptor nature. Signaling processes proceed with participation of many low molecular and high molecular mediators to participate and biophysical, biochemical and genetic reactions. One fact attracts attention that the same mediators are involved to signaling ending by principally different final biological effect.This allows to suggest the existance in plant cell no separate chains for each stimulus but regulatory network formed by lateral and horizontal transduction chains.