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[目的]研究Pb2+、Cd2+及其复合处理对云和雪梨树苗生理生化指标的影响,为种苗生产提供参考。[方法]采用因子分析法,研究Pb2+、Cd2+及其复合污染对云和雪梨苗生理机能的影响。[结果]Pb2+、Cd2+污染抑制树苗的生长,影响梨苗叶绿素的含量,抑制超氧化物歧化酶(SOD)活性,提高梨苗丙二醛(MDA)和可溶性蛋白质含量,刺激谷胱甘肽(GSH)合成,Pb2+、Cd2+之间的相互作用复杂。[结论]Pb2+、Cd2+污染云和雪梨苗,抑制叶绿素的合成,增强超养阴离子自由基(O2-.)对植株的毒害性,使膜脂过氧化损伤程度高,受重金属污染植株启动保护酶系统,以增强植株的抗氧化性。Pb2+、Cd2+相互作用机制复杂。
[Objective] The research aimed to study the effects of Pb2 +, Cd2 + and its compound treatment on the physiological and biochemical indexes of cloud and Sydney saplings and provide a reference for seedling production. [Method] The effects of Pb2 +, Cd2 + and their combined pollution on the physiological functions of cloud and Sydney pear seedlings were studied by factor analysis. [Result] Pb2 +, Cd2 + pollution inhibited the growth of saplings, affected the content of chlorophyll, inhibited the activity of superoxide dismutase (SOD), increased the contents of malondialdehyde (MDA) and soluble protein, and stimulated glutathione GSH) synthesis, the interaction between Pb2 +, Cd2 + complex. [Conclusion] Pb2 +, Cd2 + pollution of cloud and Sydney seedling could inhibit the synthesis of chlorophyll, enhance the poisoning of plant by hyper-nutrition anion radical (O2-.), Make the damage of membrane lipid peroxidation high, System to enhance the plant’s resistance to oxidation. Pb2 +, Cd2 + interaction mechanism is complex.