From binding proteins to hormone receptors?

Phytohormones exert in responsive plant cells specific biochemical and physiological effects. It is a widely held view that phytohormones are first recognized by specific receptors which initiate the transduction of the hormonal signal. While hormone receptors are well studied in many eukaryotes ranging from yeast to man, we are lacking a detailed understanding of phytohormone receptors. Phytohormone binding proteins have been suspected to provide candidates for such receptors. In this review recent progress towards molecular analysis of such proteins and their genes will be summarized.