2002 Volume 71 Issue 6 Pages 783-788
Lateral branches on 15-yr old Japanese persimmon (Diospyros kaki L. cv. Saijo) trees were partially strapped with wires (2 mm diam) 20 days before (BFB) and at full bloom (FB) to test their effects on fruit growth and carbohydrate accumulation by the leaves, stems, and fruit. The wires were not removed during the experiment. Fruit size and weight, peel coloration and Brix value at harvest were promoted by the treatments. Treatment at BFB significantly improved fruit weight and quality. During Stage I, fruit growth was promoted by the treatment. Specific leaf weight and carbohydrate contents of leaves were increased significantly 1 or 2 weeks after treatments. These results are attributed to the strapping which limited downward transport of the photosynthates in the lateral branches. During Stage III, fruit growth was significantly promoted by the strapping treatment at BFB. In this stage, the wires were imbedded in callus tissue and there was no difference in carbohydrate accumulations by leaves and shoots among the treatments. These results indicated that the mechanism of rapid fruit growth in Stage III by strapping lateral branch at BFB would be different from that in Stage I.