Abstract
Inhibition of physiological fruit drop in satsuma mandarin with AVG (2-aminoethoxy vinyl glycine) was evaluated. The rate of ethylene production by the fruit and the levels of ACC, ABA-like and IAA-like substances in the fruit were determined. The relationship between the dynamics of these substances and physiological fruit drop is discussed.AVG sprayed at petal fall significantly inhibited fruit drop of 33-year-old satsuma cv. Miyagawa-Wase. There was no difference between the quality of AVG treated and untreated fruit at harvest.AVG significantly inhibited the release of ethylene from young fruit for 2 weeks after treatment, and decreased ACC content in fruit for 3 weeks. These inhibitions disappeared by 4 weeks after application.The level of ABA-like substance in untreated fruit increased in the early stage of fruit drop, whereas that of treated fruit remained low. The AVG treatment increased the level of IAA-like substance which remained higher than that of the control throughout the experiment.
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