铅铜离子胁迫对小麦种子萌发的生态毒理效应  

Ecotoxicological Effects of Lead and Copper on Seed Germination of Wheat

作　　者：时唯伟[1,2] 奚涛[2] 金海燕[2,3] 支月娥[2] 罗大民[1] 周培[2] 

机构地区：[1]厦门大学生命科学学院,厦门361005 [2]上海交通大学农业部都市农业(南方)重点实验室,上海200240 [3]辽宁师范大学生命科学学院,大连116029

出　　处：《上海交通大学学报（农业科学版）》2009年第3期196-199,共4页Journal of Shanghai Jiaotong University(Agricultural Science)

基　　金：国家高技术研究发展计划(863计划)项目(2007AA10Z441);上海市科委项目(07DZ12055);上海市科委项目(07JC14025)

摘　　要：通过种子萌发试验,研究了不同浓度的Pb2+和Cu2+对小麦种子萌发、幼苗生长以及对小麦α-淀粉酶活性的生态毒理效应。结果表明:Pb2+在低浓度下(<0.5mg·L-1)对小麦种子萌发、幼苗和根的生长有促进作用,但随着Pb2+浓度的增大,此促进作用转变为抑制作用;Cu2+(>5mg·L-1)对小麦种子萌发过程中的各项指标皆为抑制作用;Pb2+、Cu2+胁迫对小麦α-淀粉酶活性存在低浓度激活和高浓度抑制的效应,且浓度越高,抑制作用越强;Cu2+对小麦种子萌发各项指标的抑制率大于Pb2+,Pb2+、Cu2+对小麦根生长的毒害作用大于对地上部的影响。By seed germination experiments, We studied ecotoxicological effects of Pb2＋, Cu2＋ on the seed germination, seedling growth and or-amylase activity of wheat. The results showed that the seed germination and seedling growth of wheat could be promoted at low concentrations of Pb^2＋ （under 0.5 mg.L-1）, while they would be inhibited when the concentration of Pb^2＋ was high; Cu^2＋ in high concentrations （above 5 mg·L-1） could reduce the germination rate, the seedling growth and vigor markedly; the activity of α-amylase could be enhanced at low concentrations of Pb^2＋ or Cu^2＋ but be inhibited at high concentrations, and the injury became severer with the increase of concentration; the inhibition of Cu^2＋ on seedling growth indices of wheat were larger than that of Pb^2＋, the stress effects of Pb2. or Cu^2＋ was stronger on seed germination than seedling growth.

关 键 词：PB2+ CU2+ 小麦 种子萌发 生态毒理效应 

分 类 号：X173[环境科学与工程—环境科学] S181[农业科学—农业基础科学]