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|標題:||Effects of Dry heat bulb treatments on Flowering Promotion of Polianthes tuberosa L.|
Polianthes tuberosa L.
Double veriety of Polianthes tuberosa L. was used in this experiment. After harvesting in different season, the bulbs were subjected to various treatments, in order to evaluate the effect of temperature and drying period on the growth bolting and flowering of the tuber. The treatments included; 1. Drying with high temperature (30℃) in an incubator and natural drying outdoor for a period of 0, 15, 30, 45 and 60 days, during winter season. 2.Drying during summer months indoor and outdoor under plastic cover for a period of 1, 15, 30, 45 and 60 days. 3. Drying at 30℃ and 15℃ respectively. The results were as follows: After drying with high temperature, those stored at 30℃ for 45 days which showed the best results of promoted sprouting, bolting and flowering. The treated samples, after analyzing was found containing high levels of endogenous growth promoting substances in the acidic fraction of ethyl acetate. No growth inhibitor was found in the same sample. However the control had a relativity high level of growth inhibited substances, thus caused a delay in sprouting, bolting and flowering. Natural drying during summer months resulted in a higher bolting and flowering rate in the control as compared to the treated. The responsed of those natural drying under plastic cover outdoor was unfavorable. Natural drying indoor had better results than those natural drying under plastic cover outdoor. Apical meristem observation revealed the control was found to reach stage Ⅵ earlier than the treated bulbs. Among the different temperature treated samples during winter, those stored at 30℃ 45 days had higher activity of cytochrome oxidase and also earlier in the differentiation of apical meristem. Those samples treated at 15℃ 30 days, 30℃ 15 days + 15℃ 15 days together with the untreated had the lowest enzyme activity and also slower in the differentiation of apical meristem.
|Appears in Collections:||第07期|
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