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

in Journal of the American Society for Horticultural Science
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  • 1 Department of Pomology, University of California, Davis, CA 95616


Movement of 14C-photosynthates in bearing and nonbearing branches of pistachio (Pistacia vera L.) was examined during the period of inflorescence bud abscission. Most of the 14C transported from leaves accumulated in developing nuts. Inflorescence buds on defruited trees accumulated twice as much 14C-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.

Contributor Notes

Received for publication April 1, 1980.

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Current address: Center for Viticultural Science and Small Farm Development, Florida A & M University, Tallahassee, FL 32307.