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

Abstract

The research work aimed at investigating the effect of pre-harvest gibberellic acid (GA 3 ) treatment on the quality of 'Dbilnaja' 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.

Effect of Various Post Harvest Treatments on Storage Behaviour of Aonla cv. Chakaiya

“…Chakaiya fruits treated with GA 3 (300 ppm). Similar results were obtained by Harman and Sen (2016) from the studies of GA 3 (100 ppm) treatment on 'Obilnaja' and 'Black Star' cultivars of plum.…”

“…The increase in sugar content in fruits during post-harvest storage depends upon respiration rate and a complex series of enzymatically controlled biochemical reaction such as a conversion of starch. Earlier workers have reported that the application of GA 3 showed slight increase in total sugar contents during storage pe riod in Banana (Duguma et al, 2014) and in plum (Harman and Sen, 2016).…”

Preharvest salicylic acid and delay ripening of ‘superior seedless’ grapes

“…The color (Hue angle) changes in the clusters were also related to aging cluster tissue. Moreover, the change in hue angle value is related to water loss during shelflife as reported to [22]. Firmness and separation force are considered the main indicators in judging the table grape quality from customers.…”

Effects of Plant Growth Regulators on Plum (Prunus domestica L.) Grown on Two Rootstocks at Harvest and at the Postharvest Period

“…In terms of plums, the majority of postharvest research was conducted on Japanese plums [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] as compared to European plum cultivars (P. domestica L.) [34][35][36][37][38][39][40]. Only a few of those studies address the postharvest effects of preharvest PGR application (primarily GA 3 ) [4,[41][42][43][44][45] exclusively on Japanese plum [4,[34][35][36][37][38]. Preharvest application of GA 3 increased the fruit weight and size of Japanese plums at harvest, as well as fruit firmness and TSS during storage, manipulation and transport, and limited weight loss [36][37][38], which made fruits more acceptable after the storage period [35].…”

“…The influence of BA application on fruit quality at harvest or postharvest properties of plums grown in Europe, to our best knowledge, has not been investigated so far. GA 3 was commonly applied in stone fruits at lower rates from 10 to 100 ppm [4,10,[42][43][44][45] and in repeated treatments to achieve fruit quality improvements [44]. BA was applied in stone fruits at concentrations from 50 to 400 ppm.…”