Abstract
The present report aims to analyze the mechanism of fruit abscission under high night-temperature (HNT) conditions which promote the abscission.The relationship between the rate of fruit abscission and ethylene evolution was investigated for the apple cultivars Tsugaru, Starking Delicious (SD) and Fuji. The rate of fruit abscisson of ′SD′ was the highest, followed by that of ′Tsugaru′ and then ′Fuji′. Ethylene evolution from these fruits also showed a similar trend.Application of 100ppm ethephon gradually increased the rate of seed abortion and fruit abscission with time after treatment. Aminoethoxy-vinylglycine (AVG) application prevented ethylene evolution and reduced the rate of seed abortion, fruit abscission and cellulase activity in the abscission zone.Based on these results, it is concluded that the increase in endogenous ethylene levels of fruit prevented seed development and caused fruit abscission under HNT treatment, and that the most susceptible cultivars were the ones in which ethylene evolution was the highest.
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