CARBON PARTITIONING AND TRANSLOCATION IN PRIMOCANE-FRUITING RED RASPBERRIES (RUBUS-IDAEUS L)

Leaf removal, cane girdling, and C-14 translocation patterns were used to study source-sink relationships of primocane-fruiting (PF) red ras pberries. Although the leaves in the reproductive zone were most impor tant for vegetative and reproductive development, compensatory effects between the cane leaves were evident. When C-14 translocation was stu died in the reproductive portion of the cane, the lateral closest to t he C-14-treated leaf was the major sink for carbohydrate from that lea f, independent of leaf position or reproductive development. Thereafte r, partitioning to leaves and/or flowers or fruits above the C-14-trea ted leaf was related to leaf phyllotaxy 75% of the time.