Effects of Se on Growth Status and Physiological Property of Pisum sativum Seedlings under Hg Stress

[Objective] To investigate the effect of Se on the growth status,the cell division of root tips,the activity of the peroxidase(POD) and the germination of the Pisum sativum seedings under the Hg stress.[Method] By means of water cutivation method,the study was conducted to investigate the effect of Se in different concentration(0、0.1、0.2、0.4、0.8、1.2、1.6 mg/L)to the seed germination rate,the growth of the plants under different Hg contamination(0、0.5、1.0、5.0、10.0、20.0、50.0 mg/L).[Result] The results showed that the growth status and germination of the Pisum sativum seedings was promoted under the conditions of Hg concentration ≤ 50 mg/L and the Se concentration ≤ 0.8 mg/L.The effects of promoting the radicle cell division and decreasing the radicle aberration rate were best under the conditions of Hg concentration 5 mg/L and Se concentration ≤ 0.2 mg/L.When Hg concentration was 5 mg/L,Se at the concentration lower than 1.2 mg/L could promote the synthesis of chlorophyll.[Conclusion] Se can alleviate Hg oxidative stress effect in a certain concentration range,reducing its damage on the seedling.