|Title:||氣溫與日照強度對水稻光合成物質之轉運與分配的影響||Other Titles:||Effect of Air Temperature and Light Intensity on Trauslocation and Distribution of 14C-Assimilates in Rice Plant||Authors:||林安秋
|Issue Date:||Dec-1984||Publisher:||農業試驗所||Related Publication(s):||稻作區域性與期作性低產及增產措施之研究||Start page/Pages:||73-82||Source:||農業試驗所特刊;第16號||Abstract:||
The purpose of this study was to clarify the effect of air temperature and light intensity on translocation and partition of 14C-assimilates in rice plants, so that ot elucidate the causes of low yield of the second rice crop in Northern Taiwan. The results were summarized as follows
1. The distribution of 14C-assimilates in the rice leaves after one-day 14C-labelling and temperature treatment under natural solar radiation condition was the lowest at high air temperature (30˚~25℃, day-night temperature), and the highest at low temperature (20˚~15℃). Two cultivars showed the same trend. The similar result was obtained at high temperature, however, no regular trend was observed at medium or low temperature under 60% of shading.
2. The translocation of 14C-assimilates from the leaf to the culm after one-day treatment was about 50% of total labelling at high temperature, 20% at medium temperature, and 10% at low temperature. Then, it was increased after ten days at medium and low temperatures. Thus, the translocation of 14C-assimilates from the leaf to culm was faster at high temperature than that of low temperature.
3. The accumulation of 14C-assimilates in the panicle at harvest time under natural solar radiation condition was higher at medium temperature than the other treatments, and lowtemperature was the least. While it was much more at high temperature, and low temperature was still the least under 60% of shading. Two cultivars had same results. Thus, the optimum temperature for the accumulation of 14C-assimilates to the panicle seems to be at medium temperature (25˚~20℃).
4. The partitoning of 14C-assimilates in the leaves at harvest time did not show any regular trend. In general, it was much more at upper leaves than the lower ones.
5. In conclusion, 14C-assimilates was translocated from the leaf to culm or panicle much more at high temperature, while at low temperature, lesser of that was translocated to cuim and panicle but more of that was accumulated in the leaf. Thus, the high temperature (30˚~25℃) is beneficial for the translocation and accumaulation of the 14C-ssimilates to the panicle. No clear trend of the effect of light intensity on translocation aand distribution was found in this experiment. It may be considered that the air temperature is more responsible for translocation of 14C-assimilated than the light intensity.
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