中文摘要：

我国农业土壤Cd,Cu和Pb污染严重,威胁食品安全.该研究以十字花科植物芥菜为试验材料,通过盆栽均匀设计试验,探讨了重金属Cd,Cu和Pb及其交互作用对芥菜生长及生理特性的影响.结果表明：Cd-Cu-Pb复合效应显著抑制了芥菜的生长,地下部受损伤程度大于地上部,并且抑制w（叶绿素）,叶绿素a对复合污染更为敏感;Cu-Pb复合效应对芥菜生长的抑制作用远大于其他因素,有利于提高w（叶绿素）,Cd是导致w（叶绿素）降低的主要因素.w（Cu）低于200mg/kg时,芥菜叶片SOD酶活性显著高于对照（P〈0.05）,反之,SOD酶活性急剧下降,丙二醛（MDA）与脯氨酸大量积累.

英文摘要：

The agricultural soil in China is seriously polluted by Cd,Cu and Pb,which threaten food safety.In the present study,cruciferous mustard plants were used in potted experiments with uniform design as experimental material to investigate the effects of heavy metals Cd,Cu and Pb,and their interaction on growth and physiological characteristics.Results indicated that the Cd-Cu-Pb compound effect significantly inhibited the growth as well as chlorophyll content of the mustard,and chlorophyll a was more sensitive to compound pollution.The underground parts of the plant received much more serious injury than the above ground parts.Moreover,the inhibitory effect on mustard growth of the Cu-Pb compound effect was greater than other factors.In contrast,the Cu-Pb compound effect could promote chlorophyll level to some extent,while Cd was the main influencing factor that induced the decrease of chlorophyll.The SOD activity of the mustard leaves significantly increased in contrast to the control group when the Cu concentration was below 200 mg /kg under compound pollution.However,the opposite effect was observed when the Cu concentration was more than 200 mg /kg,which stimulated substantial accumulation of MDA as well as praline.