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KMID : 0903619980390050555
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Journal of the Korean Society for Horticultural Science
1998 Volume.39 No. 5 p.555 ~ p.559
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Effect of Gibberellic Acid on Seedlessness Induction and Berry Development in ´ Campbell Early ´ and ´ Kyoho ´ Grapes by GA Grown in Non - heated Plastic House
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Jeong, Sang Bouk
Lee, Hee Jae/Chung, Soon Ju
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Abstract
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Responses of ´Campbell Early´ and ´Kyoho´ grapes grown in a non-heated plastic house to gibberellic acid (GA₃) application were compared with respect to seedlessness induction and the subsequently developed berry characteristics. The flower clusters were dipped in a GA₃ solution of 100 ppm in ´Campbell Early´ and of 25 ppm in ´Kyoho´, at 14, 7, and 0 days before full bloom and again the resulting berry clusters at 10 days after full bloom. The highest seedlessness rate was obtained with GA₃ treatment at 14 days before full bloom for ´Campbell Early´ and at full bloom for ´Kyoho´ grapes. In ´Campbell Early´ grapes, the GA₃ applications greatly reduced the cluster and the berry weight. In ´Kyoho´ grapes, on the other hand, the GA₃ applications increased the cluster weight, except for the treatment at 14 days before full bloom. The berry weight of the GA₃ treated ´Kyoho´ grapes was lower than that of the untreated control, but the GA₃ application at full bloom did not reduce the berry weight. At harvest, soluble solids content and titratable acidity of the treated berries of both cultivars were not significantly different from those of control berries. With the GA₃ application, the berry set rate was greatly reduced in ´Campbell Early´ grapes and the development of shot berries was obvious. By contrast, the GA₃-treated ´Kyoho´ grapes set more berries, mainly of seedless berries, than those of the untreated ones. With the GA₃ application, the rate of berry shattering, mainly due to berry drop, was greatly reduced in ´Kyoho´ grapes, but increased in ´Campbell Early´ grapes. Our results suggest that GA₃ application could be used in ´Kyoho´ grapes for inducing seedless berries, enhancing berry set, and reducing berry shattering, but not in ´Campbell Early´ grapes.
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