Application of benzyladenine (BA) to portions of a bean leaf either along or across the midvein or to one of the two primary leaves, on intact plants, retarded senescence of the treated part. When 14carbon labeled CO2, IAA, leucine, or sucrose was fed to the untreated part on the same leaf, or to the untreated opposite leaf, there was less than 2% of the total radioactivity in the BA treated part after 24 h. It is concluded that retardation of leaf senescence by BA on intact bean plants is not dependent on mobilization of metabolites from other parts of the leaf.