中文摘要：

以大白菜（Brassica campestris L.ssp.pekinensis）品种＂太原二青＂幼苗为试材,采用聚乙二醇（PEG-6000）模拟干旱胁迫,研究了在干旱和弱光2种胁迫同时存在的条件下,白菜幼苗活性氧清除酶系统及其膜脂过氧化相关生理指标的变化及2种胁迫的相互作用。结果表明：白菜幼苗过氧化酶系统在单一弱光胁迫条件下超氧化物歧化酶（SOD）、过氧化物酶（POD）、抗坏血酸过氧化物酶（APX）活性随光强的减弱呈现明显上升趋势;在同时施加干旱胁迫后,白菜幼苗基本保持了原有的抗氧化酶系统变化趋势,但是由于干旱胁迫的存在,弱光胁迫没有使得H2O2和丙二醛（MDA）持续上升。

英文摘要：

Chinese cabbage of‘Taiyuan Erqing＇was used as test material,the activity of peroxidase scavenging enzyme systems and membrane lipid peroxidation related indicators in seedlings of Chinese cabbage under drought and weak light stresses coexisting condition were detected and the interaction between drought stress and weak light stress were analyzed.The results showed that the enzyme activity of SOD,POD,APX increased with the decrease of light intensity in seedlings of Chinese cabbage.Under drought and weak light coexisting conditon,the antioxidase enzymes in Chinese cabbage seedlings remained the original change trend.But due to the co-existence of drought stress,weak light stress did not make the content of H2O2 and MDA rise continually.