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The growth-promoting hormones, the brassinosteroids (BRs), are perceived at the plant cell surface by receptor kinases that transduce the signal to the nucleus by an intracellular cascade of phosphorylation-mediated protein–protein interactions. BR signaling is also regulated by the plant endocytic machinery because the increased endosomal localization of the BR receptor enhances the BR responses. Chemical genetics is a powerful approach to identify new components in redundant signaling networks and to characterize highly dynamic processes, such as endocytosis. Here, we describe a screen in
Arabidopsis thaliana
seedlings for small molecules that affect hypocotyl elongation under continuous light conditions, indicative for an effect on BR responses. The compounds identified in this screen were used to dissect endomembrane trafficking of the BR receptor, BR INSENSITIVE1, a process that is essential for BR signal transduction.
