A decrease of source-sink ratio prompted a decrease in SOD activity,POD activity and soluble protein content in ear leaf, the reason of which maybe defoliation caused leaf hurt.

• 高油玉米果穗叶的 SOD、POD、PEP 羧化酶等酶活性及可溶性蛋白质含量,随源/库比的减小而降低,叶片的光合速率、光合色素含量等随源/库比的减小而显著增加,且增幅大于普通玉米。