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KMID : 0903619840250010037
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Journal of the Korean Society for Horticultural Science
1984 Volume.25 No. 1 p.37 ~ p.44
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Growth Patterns and Seasonal Changes in Chemical Compositions of Leaves , Shoots and Berries in Seedless Grapes Induced by Gibberellic Acid
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Abstract
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This experiment was carried out to clarify the growth and development patterns in leaves, shoots and berries of `Delaware´ and `Early Steuben´ treated with gibberellic acid for seedless grapes. The clusters were dipped twice with 100ppm gibberellic acid: 10 days before and after the full bloom.
The results obtained are as follows:
1. The growth pattern of leaves and shoots
a) The leaf and shoot growth expressed with logistic growth curves exhibited two cycles and maximum growth was only significantly different between cultivars in all quantitative characters except leaf number.
b) All the quantitative characters except leaf dry weight, interpreted with specific growth rate, indicated a decreasing point of inflection on May 19. Generally, Delaware showed more vigorous growth than Early Steuben until May 19, thereafter Early Steuben showed more vigorous growth than Delaware in most characters.
2. The growth of berries
a) Fruit shape index, in spite of Gibberellic acid treatment, tended to depend relatively upon genetic characteristics of the cultivars in the ripe stage.
b) Cumulative growth curve of berry fresh weight showed a double sigmoid in both cultivars. However, the curve of Early Steuben was more typical than that of Delaware.
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