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KMID : 0903619840250020116
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Journal of the Korean Society for Horticultural Science
1984 Volume.25 No. 2 p.116 ~ p.122
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Growth Ptterns 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 seasonal changes of chemical compositions and their inter-relationships in leaves and shoots 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. Changes of leaf dry matter content showed two peaks in both cultivars: a lower peak on June 2 and higher one on Sep. 6. Shoot dry matter content of Delaware was greater until Aug. 3 than that of Early Steuben. But thereafter, there was no difference in shoot dry matter content in both cultivars.
2. Total nitrogen contents of Early Steuben were higher than those of Delaware throughout the season in leaves and shoots. Total nitrogen contents of leaves decreased gradually while those of shoots tended to initially decrease until Sep. 6 and there after increase in both cultivars.
3. Ash contents of leaves in both cultivars increased from the date of July 7 after initial decrease while those of shoots decreased throughout the season.
4. Total carbon contents in leaves and shoots gradually increased throughout the season. Total carbon content of Delaware in leaves was greater than that of Early Steuben while no difference was noted in shoots between cultivars. Starch contents of shoots increased after harvesting in both cultivars, that of Early Steuben being higher than Delaware.
5. The ratio of carbon in total carbohydrate to carbon in protein (C-C/C-P ratio) in leaves tended to increase throughout the season, Delaware being higher than Early Steuben. The ratio of C-C/C-P in shoots fluctuated from rapid increase to sharp decrease on Sep. 6 in both cultivars.
6. Total sugar contents in leaves and shoots showed two peaks in both cultivars, those of Delaware being consistently higher than Early Steuben. In leaves, the first peaks were lower than the second while they were reversed in the shoots.
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