| WANG QIONG.铜胁迫对不同鸭跖草抗氧化系统和矿质营养代谢的影响[J].广东农业科学,2021,(7-8):- |
| Effects of copper stress on antioxidant system and mineral metabolism of different Commelina L. |
| 投稿时间：2021-04-08 修订日期：2021-04-19 |
| DOI： |
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| 摘要点击次数: 511 |
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| Abstract: |
| [Objective] In order to find out the effect of copper stress on the seedling growth, physiological index changes and mineral nutrition accumulation in Commelina communis and Commelina?purpurea?, screen out Commelina L.for remediation of copper pollution in Dianchi Lake.[Method]By taking hydroponics method, Commelina communis and Commelina?purpurea?were used as biological materials to analyze the effects of chlorophyll content, antioxidant enzyme activity and mineral nutrition metabolism under different copper stress concentrations(0，25，50，75，100，125mg/L)..[Result] Fresh weight, dry weight and chlorophyll a content of Commelina communis and Commelina?purpurea were inversely proportional to copper stress concentration, while the content of chlorophyll b was proportional to the concentration of copper stress. On the 7th day, the effect of copper on the enzyme activity of Commelina communis was different, SOD activity decreased first and then increased slightly, POD activity and MDA content increased continuously, but CAT activity decreased under different copper stress concentrations, when the concentration of copper was 125 mg / L, the activity of CAT was only 66.7% of the control.?Furthermore SOD, POD, CAT activities and MDA content of Commelina?purpurea increased.?On the 15th day, SOD activity of Commelina communis changed a little, and CAT activity decreased, but POD activity and MDA content increased with the increase of stress time. Meanwhile the SOD activity of Commelina?purpurea was 2. 65 times of that on the 7th day when the concentration of copper was 75mg / L, POD activity increased first and then decreased, CAT activity and MDA content decreased. Commelina communis and Commelina?purpurea had active absorption capacity for copper, which caused the copper content in leaves and stems increased significantly, but Zn and Mg content changed little, Fe and K content increased first and then decreased. Through comparative analysis, it was found that the accumulation of copper in the leaves of Commelina purpurea was higher than that of Commelina communis, the accumulation of copper in the leaves of Commelina purpurea was 1.12～10.12 times that of Commelina communis, the average accumulation of copper in stem was 2～10 times of that in leaf. [Conclusion]The toxic response of Commelina communis and Commelina?purpurea was different under copper stress. Commelina communis has stronger ability of antioxidative stress than that of Commelina purpurea. the stem is the main part of copper absorption and enrichment of Commelina communis and Commelina purpurea.Commelina communis can be used as the preferred species for monitoring and remediation of copper pollution in Dianchi Lake |
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