Abstract:

Abstract：The water culture experiment was conducted to investigate the effects of different concentrations of Si (0、30、60、90 mg/L, SiO2) under 3 mg/L Cd stress on seedling biomass, Cd content in plants, catalase (CAT) activity, malondialdehyde (MDA) content and proline (Pro) content. The results showed: the fresh weight of rice shoots and stems was increased by 11.1%～14.39%, that of roots was increased by 15.7%～25.7%, the height of plants was increased by 8.0%～13.6%, the content of Cd in plants was decreased by 23.9%～26.5%, the activity of CAT was increased by 12.3%～16.6%, the content of MDA was decreased by18%～25% and the content of Pro was decreased by 31.5%～33.7% compared with the treatment without Si addition. The correlation was significant between the treatment adding Si and not. A negative correlation between CAT activity and Cd content of rice plant was found(r=0.980＊＊;n=5). A positive correlation between MDA content and Cd content of rice plant was found(r=0.956＊;n=5) and the same correlation was found between Pro and Cd content of rice plant(r=0.990＊＊;n=5). These results suggested that Si addition could inhibit Cd adsorption by the plants, improve physiological characteristics of rice, alleviate the toxicity of Cd to rice and promote the growth of it.