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中文摘要：
以笋王一号莴苣为试验材料，研究了不同浓度Cd胁迫对莴苣种子萌发、胚根胚芽生长、丙二醛（MDA）及抗氧化酶系统的影响。结果表明：随着Cd浓度的增加，莴苣种子的发芽率逐渐降低，而Cd对种子的发芽势、发芽指数和活力指数以及胚根的伸长则表现出低促高抑的效应。Cd对胚根生长的抑制程度较胚芽明显。随着Cd浓度的增加，胚根中MDA含量、SOD、G-POD活性明显增加，APX和CAT活性则明显降低，而胚芽中只在高浓度Cd胁迫下（100μmol／L）才发生明显变化。
英文摘要：
The effects of different Cadmium（Cd）concentration on seed germination, the growth of radicle and plumula ,melondialodehyde（MDA）and the activities of antioxidant enzymes were investigated. The results showed germination rate decreased with the increasing of Cd concentration. Germination potential, germination index, vigour index and the length of radicle were promoted at lower Cd concentration and inhibited at higher Cd concentration. Moverover, Cd had more inhibition effects on radicle growth than plumula. The content of MDA and activities of SOD and G-POD in radicle increased significantly with the increasing of Cd concentration, whereas, the activities of APX and CAT decreased markedly. The content of MDA and the activities of SOD, G-POD, APX, CAT did not change significantly except at the higher Cd concentration （ 100 μmol/L）.
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