RESUMO
To study the toxicity of copper oxide nanoparticles (CuO NPs) on plant growth, the physiological and biochemical activities of rice (Oryza sativa L. ) seedlings were detected under different kinds of treatments (CuO NPs suspension, CuO BPs suspension and CuSO4 .5H2O solution), using distilled water (d H20) culture as contrast. The results showed that the response of rice roots to four treatments was very different. After treated with CuO NPs suspension, the rice roots were seriously damaged, the root activity obviously decreased, the MDA and H202 content rose, and the activity of SOD and POD apparently increased. The effect of different treatments on rice roots followed the order of CuO NPs > CuSO4 .5H2O2 > CuO BPs > d H2O. The results demonstrated that CuO NPs had a serious effect on the root growth of rice, the toxicity of nanoparticles on rice root was not only caused by the release of Cu ion, the particles also played an important role, and that oxidative damage might be one of the main toxic mechanisms of copper oxide nanoparticles.
