【摘要】 大豆开花后叶片光合速率和气孔导度呈单峰曲线变化 ,光合速率在叶片展开后 2 1 d达到高峰 ,气孔导度在展开后 8d达到高峰 ( 1 998年 )。CAT活性、SOD活性和 POX活性的变化类似于光合速率 ,也呈单峰曲线变化 ,叶片展开后 8d内和 33d后其含量都比较低 ,一般在2 5d达到高峰。叶片可溶性蛋白质含量呈双峰曲线变化 ,分别在叶片展开后 8d和 2 5d达到高峰 ,只是前一高峰的峰值比较低。叶绿素 a、叶绿素 b和类胡萝卜素含量也呈单峰曲线变化 ,在叶片展开后 1 5d达到高峰 ,以后保持较高值 ,33d迅速下降。可见 ,大豆开花后叶片展开 8d至 33d是其功能最强的时期。更多还原

【Abstract】 After soybean flowered,leaf photosynthetic rate (PN) and conductivity of stomatal (CS) was a parbola.They maximized on 21 day and 8 day after leaf show (ALS),respectively.Like PN and CS,catalase (CAT) activity,superoxide dismutase (SOD) activity,peroxidase (POX) activity in soybean leaf also shown a parabola,with lower values during 8 days after leaf was opened (ALS) and after 33 ALS,and peaked at 25 ALS.Soluble protein content respected a double curve,and shown higher on 8 ALS and maximum content on 25 ALS.Chlorophyll a,chlorophyll b and carotenoid content were a parabola change curve,with the maximum value at 15 ALS and rapidly decreasing value after 33 ALS.Above results suggested that leaves functioned best from 8 to 33 ALS.更多还原