Effect of the La on the Growth and Development of Pea Under the Pb Stress

In this paper,the effect of the La in different concentration on the germination and growth of pea seed under Pb stress were investigated by water culture method.The results showed,at the concentration of the La≤0.8 mg/L,it promoted the seed germination.While the concentration was increased to 1.2 mg/L,the seed germination was inhibited.The low concentration La(≤0.4 mg/L)could stimulate the growth of the pea seedling under the Pb stress,increase the activity of isoenzyme and chlorophyll content of seedling,ould remittence the poisoning action of the Pb,but with the advancement of the concentration of the La,the antagonistic action of the La to the Pb fade away.When the concentration of Pb was more than 200 mg/L and the concentration of the La came to 1.2 mg/L,the La cooperate with the Pb to aggravate the poisoning action of the pea seedling.