Abstract:Fusicoccin (FC), the fungal toxin, is used widely as a tool to study acid-mediated growth responses and proton-motive-force-dependent membrane transport processes in higher plants. Its function of strong stimulation of activity of plasma membrane H+_ATPase is mediated by the interaction of FC_binding-protein (FCBP) with H+-ATPase. FCBP is one of a 14-3-3 proteins.