重金属Pb2+对玉米苗生长的影响

以水栽培的玉米幼苗为材料，用不同浓度的醋酸铅溶液处理后，分别在第10天、第20天、第30天对玉米苗的根、茎、叶分别进行Pb^2＋含量测定。分析结果：Pb^2＋在玉米体内的分布表现为根〉叶〉茎；玉米中的叶绿素含量均降低；随着Pb^2＋浓度的增大，玉米细胞的膜透性表现根〉叶〉茎依次升高；Pb^2＋对玉米的伤害率的大小表现为根〉叶〉茎。该实验为进一步研究农作物对重金属Pb^2＋的耐性和重金属Pb^2＋在农作物体内的分布提供了可参考的数据。

The Corn Seedlings are Affected by the Heavy Metal Pb2+

The corn seedlings in hydroponic culture are treated with the lead acetate solutions of various concentrations, the content of Pb~(2+) in the roots, stems and leafs of the corns at 10th day, 20th day and 30th day is measured. The analyzing conclusions are that the contents of Pb~(2+) in the corns display a sequence of root>leaf>stem, the contains of chlorophyll in corns fall off, the raising of Pb~(2+) in solutions, the membrane penetrability of the corns increased along a sequence of root>leaf>stem, and the harmful rate of Pb~(2+) display a sequence of root>leaf>stem in corns. The data of the study gives some references for the further researches of the crops, relating the endurance and the distributing of corns with Pb~(2+).