The effect of different concentrations of pre-harvest gibberellic acid on the quality and durability of ?￠????Obilnaja?￠???? and ?￠????Black Star?￠???? plum varieties

摘要

Abstract The research work aimed at investigating the effect of pre-harvest gibberellic acid (GA 3 ) treatment on the quality of ?￠????Obilnaja?￠???? and ?￠????Black Star?￠???? Japanese plum varieties. GA 3 was sprayed onto the trees during the fruit color break at 0, 25, 50, 75, and 100 ppm concentrations. After pre-cooling, the plums were placed in modified atmosphere packages and exposed to the following conditions as follows: short storage-transportation (ST) [20 days at 2 ???°C and 90% relative humidity (RH)]; distribution center (DC) (5 days at 6 ???°C and 80% RH), and shelf life conditions (SL) (2 days at 20 ???°C and 70% RH). Pre-harvest GA 3 treatments increased the fruit weight and size. Treatment of GA 3 at 50, 75, and 100 ppm increased the fruit flesh firmness and total soluble substances (TSS) values in both the plum varieties during storage, transport, and marketing; it also limited the weight loss during the marketing process. Treatment of GA 3 had no significant effects on the color, titratable acidity (TA), and the total phenolic and antioxidant activity values of plums. Pre-harvest GA 3 treatment at 50 ppm GA 3 can be thus recommended for both the plum varieties due to its effect on the fruit quality.