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Effect of Time Application and Varying Concentrations GA3 (Gibberellic Acid) on the Seedlessness of Grapes
Thesis Abstract:
The study was conducted to determine the optimum concentration and most suitable time to apply gibberellic acid (GA3) as well as their effects on the seedlessness of the 'Brazilian Hybrid' grape.
The application timings were pre-bloom, full-bloom, and post-bloom while the different concentrations of GA3 were 0 pp, (control), 50 ppm (control), 50 ppm, 100 ppm, 150 ppm, and 200 ppm.
Results revealed that application of 150-200 ppm of GA3, at full-bloom can reduce the number of seeds in the berry by 0.63, which is significantly lower than the number of seeds in the control berries with 2.73 seeds. Moreover, berries with less seeds are longer than berries with more seeds but with reduced diameter.
Fruit setting also decreased when GA3 was applied. However, it was better to apply GA3 at the later stage of flowering because higher fruit setting was recorded at post-bloom. In terms of yield, control plants and post-bloom application outyielded the rest of the treatment. In general, however, the ratio between total soluble solids (TSS) to titratable acidity (TA) in all treatments and treatment combinations is high, indicating better quality fruits.
