大豆光合作用光抑制的研究

Study on Photoinhibition of Photosynthesis in Soybean

对大豆的光抑光合进行了研究 .结果显示 ,随着光强的增加和处理时间的延长 ,叶肉细胞的光合速率下降 ;生长条件不同的大豆叶肉细胞对光抑的响应不同 ,弱光下生长的大豆叶肉细胞更容易发生光抑光合 ;光抑伤害的主要表现部位是光系统 (PS ) ;在叶片光合速率下降的同时 ,量子产量下降 ;光抑光合的过程是可逆的 ,但当恢复到弱光时 ,光合相对速率不能恢复到原有水平 .

Photoinhibition on soybean is studied, and the result shows that the photosynthetic rate of mesophyll cells is inhibited as the light intensity increased and the treatment time prolonged. The photoinhibition extent is different as the growth conditions different, it is easier to occur under conditions of low light intensity than that of high light intensity. The damage of photoinhibition is located mainly in PSⅡ. When the photosynthetic rate of leaves is photoinhibited, the quantum yield decreased. Phohoinhibition of photosynthesis is a reversible process. When it returns to low light intensity, however, the relative photosynthetic rate can not recover completely.