Performance of grape varieties grown under tropical regions for raisin yield and quality

Abstract

With the availability of antioxidants in grape raisins and its scope as one of the major processed products of grapes, there is huge demand for alternate varieties other than the presently grown commercial variety Thompson Seedless. Eight grape varieties were evaluated for physical and chemical properties of berries and raisins. The raisin recovery ranged from 27.10% (Manjri Kishmish) to 25% in other varieties. Higher yield was recorded in Manjri Kishmish (17.47 kg/Vine). Highest phenol concentration was found in Kishmish Rosavis (0.33 mg/g) followed by Black Monukka (0.31mg/g). Similar trend was observed in tannins where maximum tannins were recorded in Kishmish Rosavis (0.35mg/g) followed by Black Monukka (0.34mg/g). Reducing sugar and carbohydrate was in higher concentration in Clone 2A (71.84% and 77.04% respectively) followed by Manjri Kishmish (68.03% and 70.54% respectively). Highest protein content was recorded in Ribier (8.28%) followed by Kishmish Rosavis (7.94 %). The variety Manjri Kishmish found better for higher raisin recovery and can be a potential variety in grape growing region for raisin purpose.