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Studies on various grape genotypes through development of bearing zones and pruning severity

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Author(s): Palanichamy V#, Bhaskar Mitra, Manish Srivastav and S.K. Singh

Journal: Journal of Pharmacy Research
ISSN 0974-6943

Volume: 4;
Issue: 10;
Start page: 3488;
Date: 2011;
Original page

Keywords: Fruit bud differentiation | pruning | bud dissection | bearing zone and cane productivity

ABSTRACT
The pruning requirement of different varieties differs according to their growth behavior. Hence, separate standardization of pruning requirement is a must forall the grape cultivars for harnessing desired yield and quality. But even in research institutes, the recommendations on pruning requirement have been done onthe basis of results obtained from trials in which plants were pruned to different random levels. The recommendations were made on the basis of trials withoutfinding out the fruitfulness of the individual buds on a cane. Fruitfulness of a bud is a product of complex interaction of various factors leading to the formationof fruit bud. Fruit bud formation in grape takes place for the next year on current season’s growth, concurrent with fruit set under temperate conditions (Chadhaand Cheema, 1971). It is the consequence of transformation of vegetative primordium in to reproductive primordium in a bud. The transformation is carriedout in three stages namely, anlagen formation, formation of inflorescence primordium and formation of flower (Srinivasan and Mullins. 1981). Among thethree stages mentioned above, formation of inflorescence primordium is the most sensitive stage, though formation of anlagen itself considered to be the stageof initiation of inflorescence axis. Any imbalance among the factors responsible for formation of inflorescence primordium would make the anlagen todifferentiate in to either tendril or school. Bud fruitfulness varies with the inherent capacity of the variety. Under given environmental conditions, the numberof fruiting primordial which develop in a bud are influenced by cultivar. Different grape cultivars vary widely in their ability to initiate flowers. Hence, studieson varietals variation with regard to the most fruitful zone on a cane is of paramount significance. In general, varieties of central Asiatic origin have theirfruitful buds located farther from the base of the cane, whereas, in those of West European origin, the lower buds are as fruitful as those in the distal region(Blanganravov, 1961). It is essential to find out the bearing zone of newly developed hybrids. The knowledge that the fruit buds in grape differentiate anddevelop early in the previous season has led to the studies on the possibilities to forecast the fruitfulness of the buds in the ensuing season for meaningful pruningrecommendation on the basis of an examination of dormant buds.
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