Effect of brassinosteroids, salicylic acid and polyamines on quality and storage life of grapes (Vitis vinifera L.) cv. Flame Seedless
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Date
2013
Journal Title
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Volume Title
Publisher
Punjab Agricultural University
Abstract
The significance of preharvest application of brassinosteroids (BRs) and salicylic acid (SA) on improving quality and shelf life of grape (Vitis vinifera L.) cv. Flame Seedless was studied in two consecutive crop seasons of 2012 and 2013. Vines were treated twice with different concentrations of BRs (0.0, 0.1, 0.5 and 1.0 mg L-1) and SA (0.0, 1.0, 1.5 and 2.0 mM) at pea stage and at veraison. Clusters were harvested at commercial maturity, and evaluated for initial and postharvest quality. Preharvest treatment of 1.0 mg L-1 BRs improved initial quality, while, BRs at the dose of 0.5 mg L-1 proved effective in maintaining postharvest quality. SA, at the dose of 1.5 mM was most effective in maintaining both initial and postharvest quality. In the second experiment, potential of polyamines (spermine, spermidine and putrescine) as a postharvest dip treatment for maintaining quality and extending storage life of grape cv. Flame Seedless was investigated. Mature grape clusters were dipped in different concentrations (0.0, 0.5, 1.0, 1.5 mM) of respective polyamines for 5 min, stored in the cold room (3 - 4 oC, 90-95% RH) and followed by the evaluation of fruit quality attributes up to 75 days. The research results revealed that the postharvest dip treatment of 1.0 mM spermine or 0.5 mM spermidine or 0.5 mM putrescine extended the postharvest life of grape cv. Flame Seedless up to 60 days on the contrary to control, which was commercially acceptable only up to 45 days.
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Keywords
putrescine, postharves