论文部分内容阅读
[目的]研究有机酸对Pb、Cd污染水稻植株的解毒作用,为处理农田Pb、Cd污染提供理论基础。[方法]统计受Pb、Cd、柠檬酸、酒石酸处理的水稻种子萌发率,及水稻植株根、茎叶干重,测定植株内蛋白质以及Pb、Cd含量的变化。[结果]当Cd浓度≤2 mg/L,Pb浓度≤10 mg/L时,有机酸对水稻种子的发芽率影响不大。柠檬酸可以减轻Pb对水稻的毒害,并能促使Pb从根部向地上部转移;而酒石酸可以减轻Cd对水稻的毒害,并有利于Cd从根向叶片输送。Pb、Cd复合处理条件下,Pb的存在促进水稻植株对Cd的吸收,Cd的存在可能抑制水稻植株对Pb的吸收。[结论]不同有机酸对Pb、Cd污染水稻植株具有不同的解毒作用。
[Objective] The study aimed to study the detoxification effect of organic acids on Pb and Cd-contaminated rice plants and provide a theoretical basis for the treatment of Pb and Cd pollution in farmland. [Method] The germination rate of rice seeds treated with Pb, Cd, citric acid and tartaric acid and the changes of dry weight of roots, stems and leaves of rice plants were measured. The contents of Pb, Cd and Cd in the plants were measured. [Result] When the Cd concentration was less than 2 mg / L and the Pb concentration was less than 10 mg / L, the organic acid had little effect on the germination rate of rice seeds. Citric acid can reduce the toxicity of Pb to rice, and can promote the transfer of Pb from roots to shoots. Tartaric acid can reduce the toxicity of Cd to rice and is beneficial to transport Cd from roots to leaves. Under Pb and Cd treatments, the presence of Pb promoted the uptake of Cd by rice plants, and the presence of Cd might inhibit the uptake of Pb by rice plants. [Conclusion] Different organic acids had different detoxification effects on Pb and Cd contaminated rice plants.