Effect of gibberellin on seeded <i>Vitis vinifera</i> with special reference to induction of seedlessness

Authors

  • H. C. Dass Division of Horticulture. Indian Agricultural Research Institute .New Delhi
  • G. S. Randhawa Division of Horticulture. Indian Agricultural Research Institute .New Delhi

DOI:

https://doi.org/10.5073/vitis.1968.7.10-21

Abstract

Application of GA (25-50 ppm) to Ana:b-e-Shahi at prebloom stage decreased the bunch weight and berry number but weight of the berries was increased and up to 29.6% seedless berries were induced. GA sprays (25-50 ppm) at 2-3 days after full lbloom increased the bunch and berry weights but few seedless berries were induced.
GA application (50-150 ppm) to Bhokri grape at 10-11 days before full bloom formed more than 90% seedless berries but bunch weights and berry number were reduced. WitJh an additional second spray at 7- 8 days after full bloom, berry size was impmved but bunch weights were still reduced. At 4-5 days before full bloom application of GA, up to 41.4 % seedless berries were induced but bunch and berry weights were a,gain reduced. With another spray at postbloom stage bunch and berry weights were brought to the level of control.   
In Gros Colman (Pusa) grape, GA application (50-100 ppm) at 5-6 days before full bloom and 2-3 days after full bloom also formed seedless berries but the bunch and berry weights were reduced. IFruit set was also improvP.d at boVh stages of spray. Prebloom GA application (50-150 ppm) to Alamwick grape, produced seedless berries up to 38.29% but ,bunch and berry weights were appreciably decreased. No effect on berry number was noticed.
Application of GA (25-75 ppm) at prebloom + posbbloom and postbloom alone decreased the bunch and berry weights and berry number markedly of Bharat Early and Black Hamburg varieties. Toxic effects like shot berry formation and cracking of rachis were noticed. No seedless berries were observed. however, more berries with 1 or 2 seeds were formed at the expense of berries with 3 or 4 seeds. Even GA application at Jow concentrations to these varieties (5-25 ppm) reduced bunch weights and berry number.
The differential response of these seeded varieties of Vitis vinifera is attributed to different amounts of growth factors and inhibitors present in them.

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Published

2017-02-17

Issue

Vol. 7 No. 1 (1968): Vitis

Section

Article

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