Influence of Rootstocks on Growth Yield and Fruit Composition of Thompson Seedless Grapes Grown in the Pune Region of India
AbstractThe use of rootstocks is gaining importance in Indian viticulture due to problems associated with abiotic stresses,such as drought and salinity, and also to improve scion characteristics. Thompson Seedless is the only commercialcultivar grown for both fresh consumption and raisin making. Dog Ridge was the only popular rootstock usedby grape growers prior to late 1990s. But this rootstock was known to induce more vigour in scions, resulting inreduced bud fruitfulness and thereby fruit yield. To identify alternate rootstocks suitable for Thompson Seedless, astudy was initiated in the National Research Centre for Grapes, Pune, India during the year 2001. Five rootstockswith own rooted vines were evaluated in this study. During the initial years, Thompson Seedless grafted on DogRidge produced the highest yield, with good quality fruit. Over the years we could observe uneven bud sprouting,gaps on the cordon due to dead wood formation, and reduced yield in vines grafted on Dog Ridge rootstocks. Incontrast, Thompson Seedless grafted on 110R performed well in terms of moderate vigour, increased fruitfulnessand consistently higher yield. Dog Ridge and St. George produced a lower yield, owing to increased vigour measuredin terms of pruning weight, total shoot length and cane diameter. Rootstocks 110R, 1103P and 99R are also known toincrease water-use efficiency during critical growth stages of fruit bud differentiation and full bloom. No significantinfluence of rootstocks was observed for most of the fruit composition parameters. Larger and bolder berries wereproduced on Dog ridge and 110R rootstock, while they were the smallest on own rooted vines.
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