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干旱胁迫导致番茄叶片ＲＷＣ、Ｃｈｌ和可溶性蛋白质含量下降，质膜透性和ＡＴＰａｓｅ活性提高．短期干旱胁迫可提高叶片ＳＯＤ和ＣＡＴ活性．４ｄ以内的干旱胁迫后复水，ＲＷＣ、Ｃｈｌ和可溶性蛋白质含量升高，清除活性氧保护酶ＳＯＤ、ＰＯＤ和ＣＡＴ的活性显著提高，抗氧化物质ＡｓＡ和ＧＳＨ的水平得到恢复，ＭＤＡ得到清除，自动氧化速率降低，重新建立了活性氧产生与清除的平衡系统，ＡＴＰａｓｅ活性降低，膜系统的损伤得到修复，透性降低，恢复了原有正常的生理代谢机能．长期干旱胁迫导致叶片清除活性氧的平衡体系受到破坏，ＳＯＤ、ＰＯＤ和ＣＡＴ活性以及ＡｓＡ和ＧＳＨ的含量下降，膜脂过氧化加剧，自动氧化速率提高，ＭＤＡ积累，影响番茄正常代谢，从而加速衰老进程
Drought stress led to the decrease of RWC, Chl and soluble protein content, and the increase of plasma membrane permeability and ATPase activity in tomato leaves. Short-term drought stress can increase leaf SOD and CAT activity. Under drought stress for 4 days, the content of RWC, Chl and soluble protein increased, the activities of active oxygen protective enzyme SOD, POD and CAT were significantly increased, the levels of antioxidants AsA and GSH were restored, MDA was cleared, The oxidation rate is reduced, a balance system of active oxygen generation and elimination is established, the activity of ATPase is reduced, the damage of the membrane system is repaired, the permeability is reduced, and the original normal physiological and metabolic functions are restored. Under long-term drought stress, the balance system of reactive oxygen species scavenging was destroyed, the activity of SOD, POD and CAT, the content of AsA and GSH decreased, the lipid peroxidation increased, the autoxidation rate increased and MDA accumulated, which affected the normal metabolism of tomato and accelerated senescence process