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以烟草品种NC297为材料,分析研究了其4个留叶水平旺长期光合作用光响应曲线差异。结果表明,随着光照强度的增大,各留叶水平净光合速率、气孔导度、蒸腾速率均呈现出开始增加较快,随后趋于缓和的趋势,不同留叶水平胞间CO2浓度变化趋势与之相反,而留24片叶表现出最终胞间CO2浓度最低;在光响应曲线特征参数方面,留24片叶具有较低的光补偿点和较高的光饱和点,有效光合辐射的范围较宽,表现出较强的弱光利用能力和强光利用潜力,并且留24片叶表观量子产额、最大净光合速率均最高,说明留24片叶处理光合能力较强,光能利用较好,这可能与不同留叶水平导致的叶片大小、叶片厚度、叶面积指数不同有很大关系。
The tobacco variety NC297 was used as material to analyze the light response curve of photosynthesis at four leaf-leaved levels. The results showed that with the increase of light intensity, the net photosynthetic rate, stomatal conductance and transpiration rate of leaves remained higher and then tended to be alleviated. The variation trend of intercellular CO2 concentration at different leaves level In contrast, leaving 24 leaves showed the lowest final intercellular CO2 concentration; in the light response curve, the remaining 24 leaves had lower light compensation points and higher light saturation points, and the range of effective photosynthetic radiation The results showed that the 24 leaves showed the highest photosynthetic rate and the highest net photosynthetic rate, which indicated that 24 leaves had stronger photosynthetic capacity and light energy utilization It is better that this may be related to the leaf size, leaf thickness and leaf area index caused by different leaf leave levels.