土壤重金属胁迫下3种观赏植物生理抗性

Physiological Resistance of Three Ornamental Plants to Soil Heavy Metal Stress

为探讨蔓绿绒(Philodendron martianum)、合果芋(Syngonium podophyllum)和绿萝(Scindapsus aureum)的抗重金属污染能力,采用盆栽试验研究不同浓度铅镉处理对3种植物生理生化指标的影响。结果表明:随着铅镉处理浓度的增加,蔓绿绒和绿萝叶片游离脯氨酸含量随之升高,且蔓绿绒的增加幅度大于绿萝,而合果芋叶片游离脯氨酸含量则先升后降;除合果芋可溶性蛋白含量随着处理浓度的增加呈现先升高后下降的趋势外,蔓绿绒和绿萝均呈先升后降再略有上升的趋势;丙二醛和相对电导率含量均随胁迫浓度的增加而增大,增大幅度由高到低依次是合果芋、绿萝、蔓绿绒;SOD和POD活性均随处理浓度的增加先升高后降低,降低幅度由高到低依次是蔓绿绒、绿萝、合果芋。综合各指标变化情况,3种观赏植物对重金属Pb^(2+)、Cd^(2+)的抗性排序为:蔓绿绒>绿萝>合果芋。

In order to explore the physiological resistance rule of three ornamental plants （Philodendron martianum, Syngoniurn podophyllum, Scindapsus aureum） under the stress of two heavy metals （lead and cadmium）, a pot experiment was conducted to study relative physiological indices under different stress concentrations. The results showed that the contents of proline of P. martianum and S. aureum increased with the stress concentration,and the increase range of P. martianum was greater than that of S. aureum. The content of proline in S. podophyllum increased first and then decreased. The content of soluble protein in S. podophyllum increased first and then decreased with the increase of stress concentration,while in P. martianum and S. aureum,it exhibited the tendency of increase-decrease-slight increase. The MDA content and relative conductivity increased with the increase of stress concentration, and the increase range was in the order of S. podophyllurn〉S, aureum〉P, martianum. Superoxide dismutase and peroxidase activity in- creased first and then decreased, and the decrease range from high to low was P. martianum, S. aureum, S. podophyllurn. Considering index changes, the resistant capability of the three plants to heavy metals was P. martianurn〉 S. aureum〉 S. podoph yllum.