镉胁迫对不同品种小麦幼苗生长和生理特性的影响

Effects of cadmium stress on the seedlings growth and physiological characteristics of different wheat cultivars

以4个小麦品种(豫麦4、扬麦15、宝丰7228和宁麦13)为材料,研究了镉胁迫对水培条件下小麦幼苗生长和抗氧化酶系统的影响。结果表明:镉胁迫条件下植株的生长、叶绿素合成及硝酸还原酶活性明显受到抑制;植株体内与氧化胁迫有关的CAT和POD活性下降,H2O2和MDA含量上升;4个品种在镉处理后生长抑制和氧化胁迫程度上表现不同,显示出对镉耐性的差异,其中扬麦15对镉耐性高于其他3个品种。

In a hydroponic experiment, four wheat cultivars （Yumai 4, Yangmai 15, Baofeng 7228, and Ningmai 13） were used as test objects to study the effects of cadmium （Cd） stress on their seedlings growth and antioxidant enzyme system. The results indicated that under Cd stress, the plant growth, chlorophyll formation, and nitrate reductase activity were inhibited significantly, catalase （CAT） and peroxidase （POD） activities decreased dramatically, while H202 and malondialdehyde （MDA） contents increased. Such responses differed with test wheat cuhivars, and Yangmai 15 had a higher Cd-tolerance than the others.