The Influence of Cu~(2+) on the Antioxidant System of Juncus Effuses under the Low Temperature

摘要

The influence of Cu~(2+) with different concentrations on the growth condition as well as the antioxidant system of Juncus effuses under low temperature has been analyzed through employing the hydroponic culture in this paper. The experimental results have shown that the Cu~(2+) can inhibit the SOD activity of Juncus effuses under the low temperature in the early stage of experiment, but it can promote the SOD activity of plants in the later stages of experiment. At the same time, the promotion of 30mg?L~(-1) is stronger than the one of 60mg?L~(-1). In the beginning of the experiment, the Cu~(2+) does not significantly affect the POD activity of plants. However, it can greatly improve the POD activity in later experiment and the promotion of low concentrations is stronger than the one of high concentrations. During the experiment, the activity of CAT enzyme can be promoted by the Cu~(2+) with low concentrations. But the Cu~(2+)with high concentrations will inhibit it at first and then promote it. What's more, the promotion of Cu~(2+) with high concentrations is more effective than the one of Cu~(2+) with low concentrations. The experimental results have shown that the Juncus effuses can enhance the ability of resisting the heavy metal stress as well as improve the stress resistance of plants through adjusting the activities of oxidizing enzyme under the low temperature.