铅对赤豆种子萌发·幼苗生长的影响

目的]研究金属铅对赤豆种子萌发、幼苗生长的影响。方法]以赤豆为材料,研究不同浓度的铅对赤豆种子萌发及其幼苗生长的影响。结果]当Pb2+浓度低于200 mg/L时,Pb2+在一定程度上促进赤豆种子的发芽率、发芽势、活力指数和发芽指数,而高浓度的Pb2+对赤豆萌发有抑制作用;随着Pb2+浓度的增加,赤豆种子的根长、苗长、根重和叶绿素含量都降低;高浓度Pb2+对赤豆根生长的抑制作用大于芽。结论]低浓度铅可促进赤豆种子的萌发,同时铅对赤豆幼苗的生长表现出抑制作用。

Effect of Lead Stress on Seed Germination and Seedling Growth of Phaseolus angularis

Objective] To study the effects of Pb2+ stress on the germination of seeds and seedlings growth of Phaseolus angularis.Method] With Phaseolus angularis as the study materials,the effects of different Pb2+ concentrations on the germination of seeds and growth of seedlings were studied.Result] When Pb2+concentration was lower than 200 mg/L,it could promote the germination rate,germination vigor,germination index and vigor index of seeds.However,high lead concentration had obvious inhibitory effects on the germination of seeds.With the increase of Pb2+ concentration,the root length,seedling length,root weight and the content of plant chlorophyll were decreased.There was stronger inhibition on the growth of root than that of bud under high Pb2+ concentration.Conclusion] Low Pb2+ concentration could promote seed germination,but the growth of seedlings was inhibited by Pb2+.