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盆栽土培试验研究了重金属铅与除草剂丁草胺的复合污染对油麦菜生长及生理生化的毒性效应.结果表明土壤铅浓度小于500mg.kg-1对油麦菜发芽率的影响不明显,铅浓度为150mg.kg-1对油麦菜株高有促进作用,但对叶片过氧化物酶(POD)和过氧化氢酶(CAT)活性有明显抑制作用.土壤铅浓度为500mg.kg-1时,油麦菜根活性、叶片POD和CAT酶活性较对照明显降低,铅浓度越大,根活性和叶片酶活性越低.丁草胺浓度为2～6mg.kg-1时油麦菜发芽率明显降低,丁草胺浓度增加,油麦菜株高、生物量、根重和根活性受到抑制作用愈大,叶片POD和CAT酶活性越低.低浓度(Pb2+150mg.kg-1和丁草胺2mg.kg-1)和高浓度(Pb2+500mg.kg-1和丁草胺6mg.kg-1)复合污染浓度越大,油麦菜发芽率越低,对油麦菜的抑制作用为根重>生物量>叶片POD酶>CAT酶>根活性,但对叶片叶绿素的合成有促进作用.低浓度铅与丁草胺的交互作用对生物量抑制表现为协同作用,根活性、CAT酶和POD酶活性抑制均为拮抗作用.高浓度铅与丁草胺的交互作用对油麦菜株高、生物量和根活性的抑制为协同作用,对CAT酶和POD酶活性抑制为拮抗作用,而铅与丁草胺的交互作用对叶绿素的合成有协同效应.
Pot experiments were conducted to study the toxic effects of compound pollution of heavy metal lead and herbicide butachlor on the growth and physiological and biochemical characteristics of lettuce.The results showed that the effect of lead concentration less than 500 mg.kg-1 on the germination rate was not obvious, The concentration of 150mg.kg-1 promoted the plant height of oleifera, but significantly inhibited the activities of peroxidase (POD) and catalase (CAT) in the leaves.When the lead concentration was 500mg.kg-1 , The activities of root and the activity of POD and CAT in leaves were significantly lower than those in the control, the higher the lead concentration was, the lower the root activity and leaf enzyme activity were.The germination percentage of L. bungei decreased significantly when the concentration of butachlor was 2-6 mg.kg-1, Butachlor increased the plant height, biomass, root weight and root activity, while the activities of POD and CAT in leaves were lower. The concentrations of Pb2 + 150 mg.kg-1 and butachlor were 2 mg. kg-1) and high concentration (Pb2 + 500mg.kg-1 and butachlor 6mg.kg-1), the lower the germination rate of lettuce was, > Leaf POD enzyme> CAT enzyme> root activity, but promoted the synthesis of leaf chlorophyll.The interaction between low concentration lead Inhibition showed synergism, root activity, inhibition of CAT enzyme activity and POD enzyme activity were antagonistic effect of high concentration of lead and butachlor interaction of plant height, biomass and root activity inhibition of symbiosis synergies, CAT The inhibition of enzyme and POD activity was antagonistic, while the interaction of lead and butachlor had a synergistic effect on the synthesis of chlorophyll.