镉铅复合胁迫对茭白抗氧化酶活性的影响

目的]探求重金属离子胁迫下，茭白抗氧化酶活性的变化。方法]以茭白的单季茭品种“蒋墅茭”和双季茭品种“葑红早”为试材，土壤栽培下，对Cd^2＋、Pb^2＋的单一及其复合胁迫进行有机肥和无机肥处理，测定了茭白叶片中SOD、POD、CAT等抗氧化酶活性的变化。结果]Cd^2＋、Pb^2＋的单一及其复合胁迫能在不同程度上降低两个茭白品种叶片中3种抗氧化酶的活性。复合胁迫处理时，其下降的幅度最大，Pb^2＋胁迫处理时下降的幅度最小；不同肥料处理间则以有机肥处理时两个茭白品种叶片中3种抗氧化酶的活性总体强于无机肥处理。品种闻以葑红早叶片中抗氧化酶的活性强于蒋墅茭。结论]茭白品种葑红早对重金属离子胁迫的忍耐性较强。

Effects of Cd and Pb Combined Stress on the Antioxidant Enzyme of Zizania latifolia

Objective] The purpose was to seek for the change of antioxidant enzyme of Zizania latifolia, when treated with heavy metal.Method] Change of the antioxidant enzyme in leaves of Zizania latifolia was studied on single-harvested cultivar Jiangshu and double-harvested cultivar Fenghongzao which cultured in soil with 100 mg/L Cd2+, 1 000 mg/L Pb2+ and their combined stress.Result] When treated with single stress and combined stress of Cd and Pb, the antioxidant enzyme in leaves was reduced.The reduced range order was combined stress>Cd2+ stress>Pb2+ stress.The antioxidant enzyme was higher when treated with organic fertilizer than with inorganic fertilizer.The antioxidant enzyme in leaves of Fenghongzao was stronger than Jiangshujiao.Conclusion] Endurance to heavy metal of Zizania latifolia variety Fenghongzao was stronger than Jiangshujiao.