Co-Authors:
Ben-Arie, R., ARO-Volcani Center, Department of Postharvest Science of Fresh Produce, P.O. Box 6, Bet-Dagan, 50250, Israel
Sarig, P., Extension Service of the Ministry of Agriculture, Department of Horticulture, Hakirya, Tel-Aviv, 61070, Israel
Cohen-Ahdut, Y., Extension Service of the Ministry of Agriculture, Department of Horticulture, Hakirya, Tel-Aviv, 61070, Israel
Zutkhi, Y., ARO-Volcani Center, Department of Postharvest Science of Fresh Produce, P.O. Box 6, Bet-Dagan, 50250, Israel
Sonego, L., ARO-Volcani Center, Department of Postharvest Science of Fresh Produce, P.O. Box 6, Bet-Dagan, 50250, Israel
Kapulonov, T., ARO-Volcani Center, Department of Postharvest Science of Fresh Produce, P.O. Box 6, Bet-Dagan, 50250, Israel
Lisker, N., ARO-Volcani Center, Department of Postharvest Science of Fresh Produce, P.O. Box 6, Bet-Dagan, 50250, Israel
Abstract:
Berry size of seedless grapes is generally increased by application of GA3 sprays at the time of fruit set. For certain cultivars a number of applications is required to obtain a commercially acceptable sized berry, and this may have deleterious effects on fruit bud initiation for the following year. It has been found that a similar increase in berry size can be obtained by a single application of CPPU to Perlette, Superior and Thompson Seedless cultivars As with GA3, fruit ripening and maturation were delayed following CPPU application, sometimes even more severely than with GA3. However, other aspects of development of the cluster were affected differently by each growth regulator. Such aspects include the growth of the rachis and pedicels, berry shatter after harvest and susceptibility of the berry to fungal attack and decay. These differences may be attributed to the anatomical effects of the regulators, in that CPPU increased the number and density of cells, whereas GA3 enhanced cellular expansion and decreased cell density. Each growth regulator also increased the size of seeded berries of cultivar Zeiny and fruit ripening and resistance to decay were similarly affected. When a combination of both compounds was applied, there were no additive effects on berry size, berry firmness and fruit ripening, but the relative resistance to decay conferred by CPPU, was eliminated by addition of GA3. Anatomical observations showed that the cell area and skin thickness of berries treated with both regulators were the same as for berries treated with GAR alone.
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