对来源于江苏、四川、湖南、湖北、河南和陕西的香椿〔Toona sinensis(A.Juss.)Roem.〕苗进行盆栽实验,研究干旱胁迫对香椿叶片膜脂过氧化和保护酶系统的影响。结果表明,随干旱胁迫程度的加强,6个种源香椿苗叶片中的丙二醛(MDA)含量增加,超氧化物歧化酶(SOD)和过氧化物酶(POD)活性增强,但各指标的变化幅度因种源不同而异。复水后,除重度干旱胁迫造成的SOD活性变化难以恢复外,其余指标基本能恢复至对照水平。综合MDA含量及SOD和POD活性的变化情况认为,来源于河南、陕西和江苏的香椿具有较强的抗旱能力,而来源于湖北、四川和湖南的香椿抗旱能力较弱。 

The effects of drought stress on lipid peroxidation and protective enzyme systems in leaf of Toona sinensis (A.Juss.) Roem. from Jiangsu, Sichuan, Hu'nan, Hubei, He'nan and Shaanxi provinces were studied. The results showed that MDA content and activities of SOD and POD raised with increasing of drought stress level, but the change degree of these indexes was varied as different provenances. After rewatering, MDA content and activities of SOD and POD could almost recovered to levels of CK except SOD activity change during serious drought stress. Through comprehensive analysis of MDA content, activities of SOD and POD, it is concluded that provenances of T. sinensis from He'nan, Shaanxi and Jiangsu show higher drought resistance, and weak resistance are shown in the others.