Investigation on the reparative potential of Pb pollution by ornamental plant Tradescantia sillamontana
利用观赏植物白雪姬修复铅污染的潜力研究

1/4 Hoagland nutrient solution with different Pb concentrations were used as medium to cultivate the Tradescantia sillamontana in artificial simulation experiment under Pb stress. The enrichment propensity of Lead in Tradescantia sillamontana and its change of growth and physiology characteristics under Pb stress were investigated. The results showed that between 0~1500 mg·L-1 concentrations of Pb, the contents of Pb in above-ground part increased continuously(p<0.05), while the contents of Pb in root appeared a peak at 500 mg·L-1 concentration and decreased a bit around 1000 mg·L-1. The maximum contents of Pb in the both parts of Tradescantia sillamontana appeared at 1500 mg·L-1concentration, with the levels exceeding 1000 mg·kg-1. In the Pb stress experiment, there was no Tradescantia sillamontana plants died with lead concentrations between 500~1500 mg·L-1, which demonstrated that the Pb-tolerance of Tradescantia sillamontana was very high. Additionally, the change trends of chlorophyll content, membrane permeability, content of malondialdehyde (MDA), praline (Pro) value, activity of peroxidase (POD) and nitrate reductase (NR) were similar to the reported Pb enrichment plants. In conclusion, the Tradescantia sillamontana can be applied to the phytoremediation of Pb pollution and be planted in the areas with Pb pollution.