Effects of Mercury Stress on Wheat Growth,POD and Amylase Activity

[Objective] The aim was to study the effect of mercury stress on seed germination and seedlings growth.[Method]using Zhengzhou 9023 as the experimental material and cultured in water,to study the effect of the germinating rate,seedling height,root length,seedling's fresh weight,the activities of peroxidase(POD)and amylase in leaf,root and germinating embryo at different concentrations of Hg2+(0.025,0.050,0.100,0.200,0.300,0.400,0.500 mmol/L).[Result]Low concentrations of Hg2+(≤ 0.10 mmol/L)have little effect on seed germination,seedling height,root length and fresh weight;high concentrations of Hg2+( 0.10 mmol/L)have significantly inhibited seed germination and seedling growth.Low concentration of Hg2+(≥ 0.025 mmol/L)could increase POD activity and inhibit the amylase activity significantly,and the effects have increased with the increasing of Hg2+ concentrations.[Conclusion]Hg2+ stress could change the activities of POD and amylase in leaf,root and germinating embryo,influence the energy and substrate supply which was required for normal metabolism of lipid oxidation,and inhibit seedling growth ultimately.