Effects of Se on Heavy Metal-resistance of Brassica napus under Compound Pollution of Cd and Pb

[Objective] The aim was to research the effects of Se treatments at different concn.on heavy metal-resistance of Brassica napus under compound pollution of Cd and Pb.[Method] With B.napus variety Qianyou18 as tested material,the effects of Se on heavy metal-resistance of B.napus under compound pollution of Cd and Pb were researched through seed germination experiment and seedling growth experiment.[Result] The effects of Se on B.napus growth under Cd and Pb stress were as follows:Se at low concn.promoted B.napus growth and Se at high concn.inhibited B.napus growth.The effect of Se on the activity index of B.napus seeds under Cd and Pb stress was most and that on CAT activity and soluble sugar content was secondary.In a certain concn.range(lower than 10 mg/L),Se could enhance SOD and POD activities and Pro content in B.napus under Cd and Pb stress.Se at low concn.enhanced the heavy metal-resistance of B.napus and Se at high concn.weakened its heavy metal-resistance.Se at low concn.reduced the stress from Cd and Pb on chlorophyll in B.napus and Se at high concn.aggravated this stress.[Conclusion] Se at low concn.could relieve the hazard of heavy metal pollution on B.napus to some degree.