| Summary: | 碩士 === 國立中興大學 === 農藝學系所 === 101 === The androecious and gynoecious lines of bitter gourd were used to be materials in this study. The plants at 6-8 leaf stage were sprayed different growth regulators on the apical stem. Then survey the sexual transformation of flower. This study was aimed to obtain seeds from a unisexual flower plant by treating opportune growth regulators in order to breed inbreed lines.
In androecious lines, the number of female flowers in the main vine and later vine, and the first female flowering day and node among different concentrations of growth regulators have significant difference. The interaction of growth regulators and concentrations also has significant difference. Overall, gibberellic acid (GA3) is better than ethylene. Particularly, line 449 treated with 25 ppm gibberellic acid has similar result between different experiment fields.
In gynoecious lines, the number of male flowers in the main vine and later vine, and the first male flowering day and node between different kinds of growth regulators have significant difference. Gibberellic acid cannot induce male flowers in main vine, whereas ethylene can induce few male flowers. But gibberellic acid can induce few male flowers in later vine. Neither gibberellic acid nor ethylene can effectivly induce gynoecious plant to transform male flower.
In the field of Taiwan Seed Improvement and Propagation Station (TSIPS) , line 449 treated with 75 ppm gibberellic acid has better results than 75 ppm ethylene in length, width, weight of fruit and seed fertility. In the agricultural experimental station of National Chung-Hsing University (NCHU), line 449 treated with 50 ppm maleic hydrazide (MH) has better fruit traits; however, the treatment of 25 ppm gibberellic acid and ethylene have higher seed fertility.
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