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以Ｖｃ、半胱氨酸、二苯胺作为外源自由基清除剂，进行预处理，能降低干旱条件下香蕉叶片细胞的膜脂过氧化程度和膜透性增加程度以及过氧化物酶和过氧化氢酶活性的提高幅度，延缓了超氧歧化酶活性及叶绿素、可溶性蛋白含量的下降。外源对香蕉的抗旱能力具保护作用，其中以Ｖｃ的保护效果最明显。
Pretreatment with Vc, cysteine and diphenylamine as exogenous free radical scavengers could reduce the degree of membrane lipid peroxidation and the increase of membrane permeability of banana leaf cells under drought stress as well as the increase of peroxidase and peroxidase Increased hydrogenase activity, delayed the activity of superoxide dismutase and chlorophyll, soluble protein content decreased. Exogenous on the ability of drought-resistant banana with a protective effect, in which the protective effect of Vc most obvious.