Research on Phytoremediation of Cadmium Polluted Soil by Capsella bursa-pastoris and Oilseed rape

Taking Capsella bursa-pastoris and Oilseed rape as test materials,the Cd tolerance,uptake and accumulation of Capsella bursa-pastoris and Oilseed rape under different Cd concentration in soil,and to enhance the remediation effect by adding chelator was studied.The results indicated that low concentration of Cd could increase the plant height,dry weight and chlorophyll contents of oilseed rape to some extent,while high concentration of Cd restrain the growth of Capsella bursa-pastoris and Oilseed rape,when Cd concentration was 120mg/kg,the plant height,dry weight and total chlorophyll content of Capsella bursa-pastoris and Oilseed rape was the highest.The proline content of Capsella bursa-pastoris and Oilseed rape increased with the increase of Cd in soil,when Cd concentration was 200 mg/kg,The proline content increased by 16.57 times and 17.95 times respectively compared with control.The accumulation of Cd in roots was much higher than that in shoots and seeds,the Cd contents in different parts of Capsella bursa-pastoris and Oilseed rape were significantly increased with the increase of Cd in soil,reached the highest content when Cd concentration was 120mg/kg,after that,the Cd content were decreased sharply.The Cd contents in different parts of Capsella bursa-pastoris and Oilseed rape were significantly correlated with concentration of Cd in soil,which showed that the concentration of Cd in soil could be absorbed by plants effectively and the Cd contents in different parts were mainly depended on the concentration of Cd in soil.Capsella bursa-pastoris and Oilseed rape was a promising crop to be used for phytoremediation on Cd contaminated soil,and the characteristics of Cd absorption and accumulation by the two plants were uniform which Capsella bursa-pastoris was higher than Oilseed rape.The Cd contents of above-ground and under-ground of Capsella bursa-pastoris and Oilseed rape increased with the increase of chelator which could obviously improve the transshipment and absorption of Cd in soil.