Phytoremediation of Cadmium Pollution in Soil by Oilseed Rape

Pot experiment was conducted to study the tolerance and accumulation indexes of Brassica napus L.(Qinyou No.8) under different Cd concentration,and the remediation effect was enhanced by adding chelator..The results indicated that low concentration of Cd could increase the plant height,dry weight and chlorophyll contents of oilseed rape to some extent,and high concentration of Cd restrain the growth of oilseed rape.When Cd concentration were 80 mg/kg,the plant height,dry weight and chlorophyll total content of oilseed rape reduced by 20.5%,43.5% and 64.3% respectively compared with control.The proline content was positively correlated to the Cd concentration,reached the highest of 1571.6 μg/g,was 23 times higher than control,showed certain tolerance to Cd contaminated soil.The accumulation of Cd in roots was much higher than that in stems and leaves,the Cd contents in different parts of rape and total uptake Cd per pot were significantly increased with the increase of Cd in soil,reached the highest content when Cd concentration was 40 mg/kg,after that,the Cd content were descent.Chelator addition to soil significantly increased the Cd concentration of oilseed rape,but with high concentration chelator application,the seedlings died in a few days.The plant with the 6 mmol/kg chelator application had the higher efficiency of Cd phytoextraction.This study implied that Qinyou N0.8 is a promising crop to be used for phytoremediation on Cd contaminated soil.