重金属Pb、Hg污染对3种小麦种子的萌发及抗氧化活性的影响

以水培的方法,研究了重金属Pb、Hg污染对农麦2号、农麦3号和新春23号3种小麦种子的发芽势、发芽率、芽长和抗氧化活性的影响。结果表明:Pb2+污染对3种种子的发芽势、发芽率、芽长以及幼苗的抗氧化活性均表现出抑制作用,且随着Pb2+浓度的增加,抑制作用逐渐增强;Hg+污染对农麦3号种子的发芽势、发芽率以及芽长均表现出抑制作用,浓度越大抑制作用越强,而对农麦2号和新春23号种子,浓度小于50 mg/L时,对发芽势有促进作用,发芽率和芽长影响不显著,浓度大于100 mg/L时,发芽势、发芽率和芽长都受抑制,且浓度越大,抑制作用越强。3种小麦幼苗的抗氧化活性在不同浓度的汞污染下均降低,且浓度越大幼苗的抗氧化活性越低;当Hg+浓度达300 mg/L时,Pb2+浓度达到500 mg/L时,就会严重影响3种小麦种子的萌发情况。

Effect of Pb, Hg Pollution on Germination and Antioxidant Activity of Three Kinds of Wheat Seeds

In this paper,three kinds of wheat seeds were used as experimental material to study the effects of different concentrations of Hg+ and Pb2+ Pollution on the germination rate,germination vigor,the length of bud,antioxidant activity of them by the method of water culture.The results showed that the germination rate,germination vigor,the length of bud,antioxidant activity of three wheat were all inhibitied by Pb2+ polution.With the increasing of Pb2+ concentration,the inhibition gradually increased.Germination rate,germination vigor,the length of bud,antioxidant activity of agricultural wheat No.3 seed were all inhibitied by Hg+ pollution.and with the Hg+ concentration increasing,the inhibition gradually increased,but to agricultural wheat No.2 seed and new spring No.23,when Hg+ concentration were less than 50 mg/L,germination vigor had a little increasing,but had no effect on both the average length of bud and germination rate of the seeds.And when Hg+ concentration were higher than 100 mg/L,the germination rate,germination vigor,the length of bud,antioxidant activity of them were all inhibitied,and the higher of the concentration,the inhibition was the stronger.Antioxidant activity of three kinds of wheat seeds were all decreased in different concentrations of Hg+ pollution,and the higher of the concentration,the antioxidant activity of seedlings was the lower.When the Hg+ concentration was 300 mg/L,Pb2+ concentration was 500 mg/L,the germination of three wheat seeds were affected seriously.