Effect of sun exposure on berry development and biochemical constituent in Tas-A-Ganesh grapes grafted on Dog Ridge rootstock

Bunches of Tas-A-Ganesh grapes grafted on Dog Ridge rootstock were exposed to complete sunlight, partial shade and complete shade. The data on bunch and berry quality and biochemical changes were studied at the time of harvest. Significant differences were recorded for berry weigh, bunch weight colour of bunches, etc. Bunches under complete shade recorded higher berry and bunch weight. The TSS was higher with less acidity in bunches exposed to complete sunlight and less in bunches under complete shade. Among the biochemical parameters, carbohydrate, starch, protein and reducing sugar were higher in bunches exposed to complete sun followed by partial shade and complete shade respectively. These results indicate that that berry composition is influenced by effects of sunlight exposure. Cluster location within the canopy had a significant influence by sunlight exposure. The canopy management practices like training systems, row orientation, training of vines on trellises should be considered carefully in order to achieve uniform green colour bunches and higher weight of bunches.