香根草和风车草对重金属镉胁迫的生理生化反应研究

摘要

A hydroponic experiment was carried out to study the effectiveness of malonyldialdehyde,proline,cadmium content,and cell-membrane permeability of Vetiver zizanioides and Cyperus alternifoliu,after treated with different concentrations of cadmium(Cd)solution(0 mg/L,10 mg/L,30 mg/L,40 mg/L,50 mg/L,60 mg/L).The physiological and biochemical responses and tolerance of V etiveria zizanioides and Cyperus alternifolius to cadmium stress were investigated to provide a basis for application of V etiver zizanioides in repairing cadmium contaminated soil.The results showed that the content of MDA and leaf cell-membrane permeability of V etiver zizanioides increased under cadmium stress.When the concentration of cadmium was 0~40 mg/L,the proline concentration increased with the increase of the concentration of cadmium,and decreased when the concentration of cadmium was over 40 mg/L.MDA content and cell-membrane permeability of Cyperus alternifoliu were higher than that of V etiver zizanioides,proline content of V etiver zizanioides was greater than Cyperus alternifolius,so the V etiver zizanioides’s tolerance to cadmium was stronger,and it had good application prospect in ecological restoration project of containing cadmium soil.%通过水培试验研究了不同质量浓度的重金属镉(0、10、30、40、50、60 mg/L)胁迫对2种植物体内丙二醛、脯氨酸、镉的含量以及细胞膜的透性变化的影响，探讨了镉胁迫下香根草和风车草对镉的生理生化响应和耐受能力，为应用香根草修复含镉土壤提供依据。研究结果表明，在镉胁迫下香根草植物叶片的丙二醛含量和膜透性增加。镉质量浓度为0~40 mg/L，脯氨酸质量分数随着镉质量浓度增加而增加，高于该阈值则降低。风车草丙二醛含量和细胞膜透性均大于香根草，香根草脯氨酸质量分数大于风车草，因此香根草耐受镉害的能力较强，其在含镉土壤生态工程修复中具有很好的应用前景。