海州香薷根系对铜胁迫的抗氧化响应

为了阐明铜胁迫下植物抗氧化的时间效应，以耐铜植物海州香薷(Elsholtzia haichowensis Sun)为材料，研究水培条件下100 μmol/L CuSO4处理0、2、4、6、8天后海州香薷根系在抗氧化方面的响应特征。结果表明：随着铜处理时间的延长，海州香薷根系膜质过氧化产物TBARS和H2O2含量显著增加，抗氧化酶SOD、POD、CAT和APX活性也依次升高。因此，推测在铜胁迫条件下，海州香薷根系可能通过是膜质过氧化、H2O2产生以及抗氧化酶（尤其是CuZn-SOD和POD）活性升高等来增强自身的抗性防护系统。

Antioxidant Response of Roots of Elsholtzia haichowensis Under Copper Stress

In order to clarify the time course of plant antioxidant defense to copper excess, under hydroponics, the response characters of 100 μmol/L CuSO4 treatment 0, 2 days, 4 days, 6 days and 8 days on lipid peroxidation, hydrogen peroxide （H2O2） produce and antioxidant enzymes activities in roots of Elsholtzia haichowensis, a Cu-accumulator plant, were investigated. The results showed that, Cu treatment day increase led to significantly increase on lipid peroxidation, H2O2 content and antioxidant enzymes activities in roots of E. haichowensis. It suggested that increase on the lipid peroxidation, H2O2 produce and antioxidant enzymes activities （especially CuZn-SOD and POD） could lead to the up-regulation of the antioxidant defence system in roots of E. haichowensis under Cu stress.