镉胁迫对蒌蒿生理生化的影响及富集特征研究

采集了南洞庭湖湿地优势植物蒌蒿及其根际土壤,进行了不同浓度的Cd胁迫处理,研究Cd对蒌蒿部分生理指标的影响及蒌蒿对Cd的富集特性。结果表明:低Cd浓度(15mg/kg)胁迫能促进植株的生长,增强其生物活性,高浓度Cd(50mg/kg)胁迫对蒌蒿生长产生明显的抑制作用,当Cd浓度达到70mg/kg时,蒌蒿仍能正常完成生长周期。随着Cd处理浓度的增加,蒌蒿体内叶绿素含量逐渐降低,丙二醛(MDA)含量增加,在70mg/kg处理下达到最大值;可溶性糖和可溶性蛋白的含量逐渐呈现先上升后下降的趋势。蒌蒿体内各器官对Cd的富集含量随Cd胁迫浓度的增加而显著增加,在90mg/kg条件下,根的含量为910.66mg/kg,茎和叶分别为375.92和134.62mg/kg。在Cd胁迫浓度70mg/kg处理下,蒌蒿各部位对Cd富集量增加迅速,在70mg/kg胁迫下则增加缓慢,各处理浓度下,蒌蒿的平均根茎转移系数为0.85。蒌蒿对Cd具有较高的富集和耐受能力,是Cd污染的理想修复植物。

Effect of Cadmium Stress on Physiological and Biochemical and Enrichment Characteristics

Acquisition of the South Dongting Lake and the dominant plant(Artemisia selengensis Turcz)and rhizosphere soil,for different concentrations of Cd stress treatment,Cd on some physiological indices of Artemisia selengensis and Cd accumulation of the Artemisia selengensis were studied.The results showed that low Cd concentrations(<15 mg/kg) stress could promote plant growth and enhance its biological activities,high concentrations of Cd(>50 mg/kg)stress on Artemisia selengensisinlaibited the produce obviously,when the Cd concentration reached 70 mg/kg,the Artemisia selengensis could still complete the normal growth cycle.With the increasing concentration of Cd treatment,the body of Artemisia selengensis chlorophyll content gradually decreased,malondialdehyde(MDA)content increased,increased in 70 mg/kg with the maximum.Soluble sugar and soluble protein content gradually increased and then showed a downward trend.Artemisia selengensis body each organ of Cd accumulation levels of stress with increasing concentration of Cd increased significantly,in the 90 mg/kg conditions,the root of the content was 910.66 mg/kg,stems and leaves were 375.92 and 134.62 mg/kg.Stress concentration in the Cd<70 mg/kg treatment,the various parts of Artemisia selengensis increase of Cd concentration rapidly,Cd>70 mg/kg increased slowly.Each treatment concentration,the average Artemisia selengensis roots transfer codfficient was 0.85.Artemisia selengensis had a high concentration of Cd and tolerance,was the ideal plant for repairing Cd-contaminated plants.