Translocation and Distribution of 14C-photosynthates in Bearing and Nonbearing Pistachio Branches1

Movement of 14 C-photosynthates in bearing and nonbearing branches of pistachio ( Pistacia vera L.) was examined during the period of inflorescence bud abscission. Most of the 14 C transported from leaves accumulated in developing nuts. Inflorescence buds on defruited trees accumulated twice as much 14 C-photosynthate as those on fruiting trees. Inflorescence buds competed poorly against the developing fruit for photosynthate and this might be responsible for inflorescence bud abscission and resultant alternate bearing.