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用０，１５％，２５％，３５％聚乙二醇（ＰＥＧ）溶液处理甘薯叶圆片模拟干旱胁迫，导致质膜透性和丙二醛（ＭＤＡ）累积量的增加，且都与ＰＥＧ浓度呈正相关。同时超氧化物歧化酶（ＳＯＤ）、过氧化氢酶（ＣＡＴ）、过氧化物酶（ＰＯＤ）等抗氧化酶类的活性在不同品种中有不同表现。这些酶类的活性在渝薯２０中始终高于农大红。在相同的干旱胁迫下，渝薯２０膜结构的破坏程度及ＭＤＡ的累积量都低于后者，因此被认为是更耐旱的品种。随着干旱胁迫的加重，ＰＯＤ活性无论在耐旱的渝薯２０，还是不耐旱的农大红中都呈下降趋势；ＳＯＤ活性在渝薯２０中呈波浪式变化，在农大红中呈下降趋势；ＣＡＴ活性则在两个品种中都呈上升趋势。
Treatment of sweet potato leaf discs with 0, 15%, 25% and 35% polyethylene glycol (PEG) solutions simulated drought stress, resulting in an increase in plasma membrane permeability and malondialdehyde (MDA) accumulation, Was positively correlated. At the same time, the activity of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and other antioxidant enzymes in different varieties have different performance. The activity of these enzymes in Chongqing potato 20 is always higher than the agricultural red. Under the same drought stress, the damage degree and the cumulative amount of MDA in the membrane of Yuzhu 20 were lower than the latter, so it was considered as a more drought-tolerant variety. With the aggravation of drought stress, the activity of POD showed a downward trend both in drought-resistant Yuzhu 20 and non-drought-tolerant Hongdahong. The SOD activity showed a wave-like change in Yuzhu 20 and decreased in Zhongdahong CAT activity showed an upward trend in both varieties.