麻疯树光合生理特征研究  

Study on photosynthesis physiology characteristics of Jatropha curcas L.

作　　者：夏亮[1] 邢杰[1] 王胜华[1] 陈放[1] 

机构地区：[1]四川大学生命科学学院,成都610064

出　　处：《四川大学学报（自然科学版）》2008年第2期413-418,共6页Journal of Sichuan University(Natural Science Edition)

基　　金：教育部博士点基金(20060610015);国际合作项目(2004DFB00300)

摘　　要：研究麻疯树叶片净光合速率日变化及其与环境因子的相互关系，结果表明，麻疯树净光合速率日变化呈双峰曲线，净光合速率最大值为14．4μmolCO2·m^2·S^-1，光补偿点为45μmolm^-2·S^-1，光合主峰出现在11：00，次峰出现在15：30．光合主峰有一个长达4．5h的高效光合平台期（9．8～14．4μmolCO2·m^-2·S^-1），是一天中最重要的产物积累时期．净光合速率日变化曲线表明麻疯树光合“午体”现象明显，且气孔限制是产生“午体”的主要原因，麻疯树光能利用率较高，最大值为3．52％．研究显示，麻疯树的光补偿点和光饱和点较高，为耐干旱植物，在高温高辐射时能有效的通过降低气孔导度来限制蒸腾作用．By studying on the relationship between diurnal variation of net photosynthetic rate and environmental factors of Jatropha curcas L. leaves, the change of diumal net photosynthetic rate of Jatropha curcas L, has been showed by a double-peak curve with two separate peaks at 11：00 and 15：30. These results indicated a remarkable photosynthetic ＂noon depression＂ and the main reason for that was stomatal constraint. Among the main peaks , a high efficiency photosynthesis phase （9.8 - 14.4 μmol CO2· m^-2· S^-1 ） lasted 4.5 h, which was the most important stage of production accumulation. The net photosynthetic rate maximum value was 14.4μ mol CO2 ·m^-2·S^-1 and the light compensation point was 45 μmol·m^-2·S^-1. The maximum light utilization rate of Jatropha curcas L. was 3.52 %. These results showed that under high temperature and high radiation, as a drought-tolerant plant, Jatropha curcas L. could limit transpiration level by effectively reducing the rate of stomatal conductance.

关 键 词：麻疯树 净光合速率 日变化 气孔导度 生理生态因子 

分 类 号：Q945.11[生物学—植物学]