镉铜胁迫下紫苏的生长响应和富集特征研究

通过盆栽试验,分析了紫苏(Perilla frutescens(L.)Britt.)在Cd、Cu胁迫下生长响应及其对Cd、Cu的耐性、吸收和累积特征.结果表明,在Cd处理浓度≤60mg·kg~(-1)和Cu处理浓度为≤600mg·kg~(-1)时,紫苏株高和根长均随处理浓度提高而增加,此后则随处理浓度增加胁迫作用渐趋明显.植株地上部和根部Cd的最高含量分别是331.51和991.14 mg·kg~(-1),Cu的最高含量分别为228.65和2 030.63 mg·kg~(-1).植株地上部Cd和Cu的最大富集量分别为66.70和36.52 μg·plant~(-1).植株Cd、Cu富集系数分别为2.59～15.42和0.14～1.24,迁移系数分别为0.35～1.44和0.07～0.56.因此,该植物可用于Cd、Cu污染土壤的修复.

Effect of Cadmium and Copper Stress on the Growth Response and Accumulation Characeristics of Perilla frutescens(L.)Britt.

Phytoremediation has been proven to be an alternative and additive process to conventional physical and chemical approaches for the cleanup of contaminated soils by heavy metals such as Cd and Cu. Nevertheless, to screen new accumulators and identify their tolerance, uptake and accumulation to heavy metals are the key process of phytoremediation. In this study, a pot experiment was used to investigate growth responses of Perilla frutescens(L.) Britt. And its tolerance, uptake and accumulation characteristics under Cd and Cu stress. Both the plant height and root length showed the tendency to increase with the concentrations of Cd≤60 mg·kg~(-1)(or Cu≤600 mg·kg~(-1)) in soil, and then declined as the Cd(or Cu) concentration in soil increased for the stress effect became obvious. The highest Cd concentrations reached 331.51 mg·kg~(-1) in shoot and 991.14 mg·kg~(-1) in root. Similarly, the highest concentrations of Cu in shoot and root were 228.65 and 2 030.63 mg·kg~(-1), respectively. The largest accumulation amount of Cd and Cu in shoot got to 66.70 and 36.52 μg·plant~(-1). The bioaccumulation factors in shoot were 2.59～15.42 for Cd and 0.14～1.24 for Cu, and the translocation factors reached 0.35～1.44 for Cd and 0.07～0.56 for Cu separa-tively. Therefore, Perillafrutescens was a potential plant to restore the cadmium or copper polluted soil.