大豆开花后叶片衰老规律的研究

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２１ｄ达到高峰，气孔导度在展开后８ｄ达到高峰（１９９８年）。ＣＡＴ活性、ＳＯＤ活性和ＰＯＸ活性的变化似于光合速率，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２５ｄ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２５ｄ达到高峰，只是前一高峰的峰值比较低。叶绿素ａ、叶绿素ｂ和类胡萝卜含量也呈

Senescence law of leaf after soybean flowering

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.