Abstract
This work was carried out during two successive seasons (2017 and 2018) to examine the response of ʺCrimson Seedlessʺ grapes to some pre-harvest treatments i.e. jasmonic acid (JA) at (4 and 8) mM/L and grapefruit seed extract (GSE) at (0.5 and 1) mM/L on some berries quality parameters under cold storage and shelf-life conditions. Vines were sprayed in two application times at (25th and 30th August) during 2017 and 2018, respectively. The non-ionic surfactant Tween-20 at 0.05% (v/v) was added to all treatments to reduce the surface tension and increase the contact angle of sprayed droplets. Results showed that both jasmonic acid and grapefruit seed extract treatments at different concentrations were significantly effective in reducing weight loss, berry decay, berry shatter, and total loss in cluster weight percentages during the cold storage period and shelf life as compared to the control. Also, the previous treatments significantly increased berry firmness, soluble solid content (SSC%), SSC/acid ratio, and total anthocyanin contents, where it was caused a significant decrease in total acidity percentage during the cold storage period and shelf life in comparison with control. Furthermore, the lowest values of weight loss, berry shatter, berry decay and total loss in cluster weight were founded by JA at 8 mM and GSE at 1 mM at the end of shelf life in comparison with other treatments. It could be concluded that JA at 8 mM and GSE at 1 mM as preharvest treatments are applicable for improving the storability of ʺCrimson Seedlessʺ grapes and maintaining their quality during cold storage and shelf life.
Highlights
Grapevine (Vitis vinifera, L) is one of the most important fruit crops grown in the world
The treatments of jasmonic acid at 8 mM/L and grapefruit seed extract at 1 mM/L were more effective on decreasing cluster weight loss, berry shatter, berry decay, and total loss percentages during cold storage periods as compared with other treatments
These results are in harmony with those obtained by Wang and lin (2000) reported that jasmonic acid increased the resistance of tissues against decay by enhancing their antioxidant system and their free radical scavenging capability and there is a positive correlation between antioxidant activity and total phenolic or anthocyanin content
Summary
Grapevine (Vitis vinifera, L) is one of the most important fruit crops grown in the world. Table grape is one of the moderately susceptible fruits to decay and subject to serious water loss during postharvest handling, rachis browning, which occurs as a consequence of water loss (Crisosto et al, 2001). Postharvest life of table grapes is relatively short due to water loss, skin browning, rachis dehydration and browning, berry shatter, and fungal. In this respect, gray mold (Botrytis cinerea) is the most postharvest disease of table grapes, especially in late season. Using SO2 during cold storage as a fumigant or generator is the most universal method to control fungal decay and to maintain the table grape quality (Gao et al, 2003). SO2 excellently controls fungal decay and prevents rachis browning, its residues are toxic and dangerous to human health. The objectives of this study reported here were to study the effect of preharvest spraying of jasmonic acid and grapefruit seed extract on the quality ofCrimson Seedlessgrapes during cold storage and shelf life
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