不同温度对忽地笑光响应曲线及叶绿素荧光参数的影响

目的]研究不同温度对忽地笑光合作用和叶绿素荧光参数的影响。方法]将盆栽忽地笑依次置于5、10、15、20、25、30℃的恒温培养箱内培养0.5 h,选取忽地笑的成熟叶片进行光响应曲线的测量;将盆栽忽地笑置于5、10、15、20、25、30℃的恒温培养箱内黑暗培养0.5 h,选取成熟叶片测量各项叶绿素荧光参数。结果]在25℃条件下,忽地笑净光合速率、表观量子效率、最大光化学效率最高,光补偿点最低,其次为20℃10℃15℃5℃,在30℃条件下净光合速率最低。结论]忽地笑在20~25℃范围内光能利用率最高。它对光照要求不严,对弱光和强光均可有效利用,适应性较强。

Effects of Different Temperature on Light Response Curves and Chlorophyll Fluorescence Parameters of Lycoris aurea

Objective] The effects of different temperature on the photosynthesis and chlorophyll fluorescence parameters of potted Lycoris aurea were studied.Method] After turned into the incubator under different temperature （5,10,15,20,25,30 ℃,respectively） for half an hour,the mature leaves of potted Lycoris aurea for light response curves were selected for measured with the Portable Gas Exchange Fluorescence System（Walz,GFS-3000） ; After potted Lycoris aurea were placed a constant temperature incubator（5,10,15,20,25,30 ℃,respectively） in the dark condition for half an hour,the chlorophyll fluorescence parameters were measured with a chlorophyll fluorometer （Walz,Junior-PAM）.Result] Lycoris aurea get the highest net photosynthetic rate,apparent quantum yield,Fv/Fm and lowest light compensation point at 25 ℃,followed by 20 ℃ ＞ 10 ℃ ＞ 15 ℃ ＞ 5 ℃,and the net photosynthetic rate is lowest at 30 ℃.Conclusion] Lycoris aurea have the maximum utilization of solar energy in the range of 20-25 ℃,and it is relaxed to light and has strong adaptability to live.Both weak light and strong light can be effectively used.