Liu T F, Wang T, Sun C, Wang Y M
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
J Hazard Mater. 2009 Apr 15;163(1):344-8. doi: 10.1016/j.jhazmat.2008.06.099. Epub 2008 Jul 3.
The single and joint effects of Cu(2+) and cypermethrin (CPM) on the seed germination and the elongation of root and shoot of Pakchoi were investigated. The results showed that in solution low concentrations of Cu(2+) could accelerate the germination rate of Pakchoi, whereas high concentrations of Cu(2+) could inhibit it. CPM could strongly inhibit the germination of Pakchoi in solution. However, in the joint toxicity effect, CPM reduced the phytotoxicity of Cu(2+) on the germination of Pakchoi seeds under solution conditions. In the single-factor experiments and joint effect tests of CPM and copper on the seedling growth, it was found that there were significant liner relationships between concentrations of pollutants and root elongation (P<0.05). Copper and CPM had synergic effects on root elongation of Pakchoi in solution cultivation test. However, in soil culture test, these synergistic effects were not significant (P<0.05). Meanwhile, the joint toxicity was more dependent on the effect of copper than that of CPM. The toxicity of the pollutants to seed germination, shoot and root elongation is in the following sequence: root elongation>shoot elongation>germination rate.
研究了铜离子（Cu(2+)）和氯氰菊酯（CPM）对小白菜种子萌发及根和芽伸长的单一及联合效应。结果表明，在溶液中，低浓度的Cu(2+)可促进小白菜的发芽率，而高浓度的Cu(2+)则会抑制发芽率。CPM可强烈抑制溶液中小白菜的发芽。然而，在联合毒性效应中，CPM降低了溶液条件下Cu(2+)对小白菜种子萌发的植物毒性。在CPM和铜对幼苗生长的单因素实验和联合效应试验中，发现污染物浓度与根伸长之间存在显著的线性关系（P<0.05）。在溶液培养试验中，铜和CPM对小白菜根伸长有协同效应。然而，在土壤培养试验中，这些协同效应不显著（P<0.05）。同时，联合毒性对铜效应的依赖性大于对CPM的依赖性。污染物对种子萌发、芽和根伸长的毒性顺序为：根伸长>芽伸长>发芽率。
