Effect of Zinc Stress on Growth and Zn Accumulation of Artemisia stolonifera

A pot experiment of Artemisia stolonifera was conducted to investigate its tolerance to and accumulation of Zn under Zn stress.Results show that its plant height,root length and biomass all increased with the increasing Zn concentration till Zn reached up to 500 mg·kg-1 in the soil and then declined with the rising Zn concentration in the soil,showing an obvious effect of Zn stress on the plant.Compared to control,the treatment of 1 500-3 500 mg·kg-1 Zn was much higher in POD(peroxidase) activity in roots and the treatment of 3 500 mg·kg-1 Zn was in CAT(catalase) activity in roots,however,no significant changes in POD and CAT activities in leaves were found.The highest Zn concentrations in root and shoot were found to be 999 and 3 214 mg·kg-1,respectively,and the largest amount of Zn accumulation was 3.40 mg·pot-1 in root and 17.33 mg·pot-1 in shoot.The Zn bioaccumulation coefficient was 0.26-0.82 and the Zn translocation coefficient 0.65-1.05,in shoot.Obviously,Artemisia stolonifera is a kind of plant high in tolerance to Zn and in Zn enrichment potential and can be used to remedy Zn polluted soils.