水稻两优培九与汕优63苗期Cd毒害下抗性差异的研究

Resistance Differences Between Two Cultivars Liangyiupeijiu and Shanyou63 Under Cd^(2+) Stress

以三叶期的水稻幼苗为材料,比较了Cd污染对两优培九、汕优63的光系统Ⅱ(PSⅡ)电子传递活性、丙二醛(MDA)含量、光合速率、过氧化物酶(POD)活性、过氧化氢酶(CAT)活性、超氧化物歧化酶(SOD)活性的影响。结果表明,镉污染条件下,与汕优63相比较,两优培九幼叶光合速率和PSⅡ电子传递活性降低幅度较小,丙二醛含量升高幅度较小;两优培九保护酶系统活性较高。结论与汕优63相比较,两优培九抗重金属Cd2+毒害的能力较强。

The effects of Cd2+ stress on the protective enzyme, the content of MDA, the photosynthetic characters of rice at the three- leaf stage were studied. The results showed that under Cd2+ stress, the electron activity of PS Ⅱ and the photosynthesis rate decreased, the content of MDA increased and the activities of protective enzymes of Shanyou63 increased at first and decreased afterwards. The activities of protective enzymes of Liangyiupeijiu increased steadily with lower accumulation rate of MDA and less decrease of the photosynthetic rate and electron transport activities of PSⅡ than Shanyou63. From the experiment, we concluded that Liangyiupeijiu had the stronger resistance to Cd2+ pollution than that of Shanyou63.