Effects of plant growth regulators and shading on growth and flowering of tuberose (Polianthes)
| Autor: | Chih-Hua Huang, 黃智華 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 The objective of this study is to investigate the effects of plant growth regulators, paclobutrazol and uniconazole and of shading on plant height, flower stalk length and quality of potted tuberose plants. Bulbs of tuberose strains ‘84E17’, ‘78B1’ and ‘84F3’, 2-3 cm in diameter, were planted in pots (20 cm in diameter × 20 cm height). Paclobutrazol and uniconazole treatments were given to ‘84E17’ and ‘78B1’ by 0.5-4 mg/L soil drench or 10-80 mg/L foliar spray, and 50% shading treatment combinted with uniconazole treatments was given to ‘84F3’ by 0.5-4 mg/L soil drench or 10-80 mg/L foliar spray every 30 days after planting. Uniconazole treatment significantly inhibited the growth and flowering of ‘84E17’ and ‘78B1’, but paclobutrazol did not. Soil drench of uniconazole at 4 mg/L gave the significant differences on plant height and flower stalk length, which were 6.2 cm and 43.0 cm shorter, respectively, compared to those of the control (10.7 cm and 104.6 cm) in ‘78B1’ and the days to flowering was significantly delayed about 87.2 days with the treatment of uniconazole at 80 mg/L foliar spray. When ‘84E17’ was treated with uniconazole at 80 mg/L foliar spray, plant height and flower stalk length were 8.8 cm and 36.7 cm shorter, respectively, than those of the control (14.6 cm and 105.1cm). This treatment also reduced the flower diameter by 0.9 cm and flower length by 0.92 cm compared to those of the control. Foliar spray of uniconazole at 80 mg/L significantly gave the inhibiting effects on plant height and flower stalk length of ‘84F3’, but the shading treatment did not. Without uniconazole treatment, L* and C* values of 50% shaded petals were 65.8 and 21.36, whereas those without shading were 60.72 and 28.2, respectively. By the uniconazole treatment at 80 mg/L foliar spray with 50% shading of the petals, L* and C* values were 63.06 and 21.78, whereas those without shading, they were 55.58 and 30.16, respectively. The results show that 50% shading increases L* value and decreases C* value, so that the flower color fades by the shading. In this study, uniconazole treatment at 10-80 mg/L foliar spray is easy to cause smaller and deformed flowers in ‘84E17’, ‘78B1’ and ‘84F3’ but soil drench treatment does not. Therefore, it is recommended to use the uniconazole at 4 mg/L soil drench to achieve the purpose of dwarf potted tuberose with better quality. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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