Abstract
Abstract Three experiments were conducted with double-flowering Persian violet (Exacum affine Balf.) to evaluate the effet of gibberellic acid (GA) applied at different flower bud sizes, developmental stages (ages) of the plant, and application frequencies. In Expt. 1, the greatest number of flowers was produced in plants with 8-mm bud size, with the largest flower diameter obtained with 4-mm bud size. Treatment with GA increased the number of flowers. Flower diameter was greatest with a GA concentration of 125 ppm. Plant quality of GA-treated plants was best when sprayed at 8-mm bud size with a concentration of 125 ppm. In Expt. 2, plants treated at 12 weeks after transplanting had the most flowers. Flower diameter decreased for all treated plants and all age groups in comparison with non treated plants. GA at 125 ppm produced the largest increase in number of flowers and maintained a large flower diameter. Plants treated 8 weeks after transplanting with 125 ppm GA had the most desirable plant size and flowering characteristics. In Expt. 3, a single application of 125 ppm GA was the most effective in contrast to multiple applications for flower induction, number of flowers, and flower diameter.
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