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Changes of Fruit Characteristics and storage by Gibberellin and Polyamine Treatment of Oriental Pear (Pyrus Pyriflia)  

Choi Dong Geun (Department of Horticulture, Jeollabuk-do Agricultural Research and Extension Services)
Publication Information
Journal of Bio-Environment Control / v.13, no.4, 2004 , pp. 185-193 More about this Journal
Abstract
Gibberellin (GA) treatment on fruit stalk was effective in fruit growth but reduced the shelf life of fruit. This study was carried out to improve the shelf life of GA treated fruit. Fruit characteristics were surveyed according to the treatment part and concentration of polyamine in 'Whangkeumbae', 'Yeongsanbae', and 'Chuwhangbae'. GA was treated on fruit stalk at 30 days after flowering and 100, 200, and 300 ppm of polyamine were sprayed on leaves of fruit cluster and canopy at 7 day before harvest. In GA treated fruit, fruit weight was heavier as $10\%$ and fruit hardness was lower as $0.3\~0.5\;kg$ than control in all cultivar, but sugar content and palatability were no difference in each treatment. In morphological characteristics, the distance from pith to epidermis of GA treated fruit was faraway as $42.0\%$. Fruit hardness and palatability of 'Whangkeumbae' was good in the leaves spray on the fruit stalk with 200 ppm and the leaves spray on the canopy with 500 ppm at 30 day after harvest. 'Yeongsanbae' and 'Chuwhangbae' showed the same to the result. So we knew that the effective treatment to improve the storagibility after GA treatment on fruit stalk was the fruit stalk leaves spray with 200 ppm because it needed small amount of polyamine.
Keywords
fruit stalk; storage; shelf life; growth regulator;
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