温度对绿豆离体叶片光合作用的影响

The Effects of Temperature on Photosynthesis of Detached Mungbean Leaves

绿豆离体叶片分别经 2 5、30、35、4 0、4 5、5 0、5 5℃处理 6 0min后 ,发现净光合速率和光系统Ⅱ的最大量子效率 (Fv/Fm)当温度分别高于 35和 4 0℃时明显下降 ;细胞间隙CO2 浓度的变化趋势与净光合速率的基本相反。因此认为 ,Fv/Fm比净光合速率 (Pn)更能耐受高温 ;

Detached leaves of mungbean (Phaseolus radiatus L.) were submitted to seven temperature treatments, i.e., 25, 30, 35, 40, 45, 50, and 55℃ for 60 minutes respectively. Results showed that net photosynthetic rate (P n) and the maximal quantum efficiency of PSⅡ (F v/F m) declined apparently when the treatment temperature was higher than 35℃ and 40℃ respectively. The variations of intercellular CO 2 concentration (C i) were exactly opposite to those of P n. So it was indicated that F v/F m was less sensitive to high temperature than P n. Stomatal status was not the main reason for the variations of P n in all temperature treatments.