两个酸模种群对Cu^(2+)积累和抗性的差异  

Differences in accumulation and resistance to Cu^(2+) stress between two populations of Runmax acetosa L.

作　　者：刘杰[1] 张学洪[1] 朱义年[1] 黄海涛[1] 王成贤[1] 

机构地区：[1]桂林工学院资源与环境工程系,广西桂林541004

出　　处：《生态环境》2006年第2期299-302,共4页Ecology and Environmnet

基　　金：广西青年基金项目(桂科青0542006);广西自然科学基金项目(桂科自00342001-4);广西百名中青年学科带头人项目(桂教人2004-76)

摘　　要：利用盆培实验,对种子分别来源于污染区和非污染区的两个酸模种群在Cu2+胁迫下的抗性和生物蓄积性进行了比较研究。在Cu2+胁迫下,来源于污染区的酸模种群根长和生物量受到的抑制作用明显地低于非污染区种群。当Cu2+处理浓度≥250μmol·L-1时,污染区种群的抗性指数显著高于非污染区种群(P<0.01)。在Cu2+处理浓度为50、250、500μmol·L-1时,污染区种群地上部分的铜质量分数均显著低于同处理组中的非污染种群(P<0.05)。这些结果表明酸模的污染区种群较非污染区种群对铜有着更强的抗性,并且污染区种群存在限制Cu2+向地上部分运输的机制,而这种限制运输的机制可能对提高铜的抗性起到重要作用。Bioaccumulation and resistance to Cu^2＋ stress in two populations of Runmax acetosa L. were comparatively studied with pot culture experiments. Seeds of the two populations were collected from Cu contaminated and non-contaminated sites respectively. In Cu^2＋ stress, the reductions of root length and biomass in the population from non-contaminated site are more pronounced than those in the population from contaminated site. When concentration of Cu^2＋ treatments〉250 μmol·L^-1, resistance index in the population from contaminated site is significantly higher than that in the population from non-contaminated site （p〈0.01）. At 50, 250 and 500 μmol·L^-1 Cu^2＋ treatment, copper contents in shoots of the population from contaminated site are significantly lower than those of the population from non-contaminated site （p〈0.05）. These results indicate that the populations from Cu contaminated site are more resistant to copper stress than the population from non-contaminated site, and less Cu was transported from the roots to shoots in the population from contaminated sites. The restriction of transport from roots to shoots is a possible important resistant mechanism to copper stress of the population from contaminated site.

关 键 词：铜 生物积累 抗性 酸模 

分 类 号：X173[环境科学与工程—环境科学]