Abstract
The process of budbreak was monitored in own rooted and grafted vines of 'Thompson Seedless' ( Vitis vinifera L.). Vines grafted on 110R rootstock and own rooted vines took a shorter time to achieve maximum percentage of budbreak as compared to those grafted on Dogridge rootstock. The higher starch degradation with corresponding increase in α-amylase activity was observed in buds of own rooted and 110R grafted vines till 9th day after pruning, while the α-amylase activity was least on Dogridge rootstock. In own rooted and 110R grafted vines, activity of peroxidase and polyphenol oxidase enzymes showed drastic reduction from 0-9th day after pruning. The highest phenolic concentration was observed in the buds of vines grafted on Dogridge rootstock from 0-9th day after pruning. Significant and positive correlation was observed for α-amylase activity and percent budbreak while it was negatively correlated with starch concentration in both buds and canes.
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