Effects of Silicon Preparation on Root Physiological Activity of Rice Under Cadmium Stress

摘要

The rice Dongfu 159 was used for the potting experiment to simulate soil cadmium (Cd) stress,and four silicon preparations,Si–50–G and Si–60–G at a concentration of 0.20% and Si–T–G and Si–E–G at a concentration of 0.50%,were applied at the tillering stage and booting stage of rice,respectively.The cadmium content,root vitality,root malondialdehyde (MDA) content,and antioxidant enzyme activity of each part of rice plants were determined,in order to provide a theoretical reference for exploring the mechanism of silicon fertilizer on the mitigation of Cd-stressed plants.The results showed that under the condition of cadmium stress,silicon application could significantly increase the root vitality and antioxidant enzyme activity,reduce the content of MDA,and reduce the accumulation of cadmium in various parts of rice.The treatment of Si–T–G applied at the tillering stage was the most effective in increasing the root vitality of rice,which was significantly increased by 63.00% compared with the CK.The treatment of Si–50–G applied at the stage of booting was the most effective in reducing MDA content of rice roots,which was significantly reduced by 30.16% compared with the CK.The treatment of Si–60–G applied at the stage of booting was the most effective in increasing the root superoxide dismutase (SOD) activity,which was significantly increased by 39.36% compared with the CK.The treatment of Si–60–G applied at the tillering stage was the most effective in increasing the root peroxidase (POD) and catalase (CAT) activities,which were significantly increased by 64.66% and 51.52%,respectively,compared with the CK.The treatment of Si–T–G applied at the tillering stage was the most effective in reducing Cd content of rice roots,stems and grains,which were significantly reduced by 39.53%,61.19% and 43.41%,respectively,compared with the CK,and the treatment of Si–60–G was the most effective in reducing Cd content of leaves,which was significantly reduced by 53.40% compared with the CK.

关键词

cadmium stress / rice / silicon preparation / root physiological activity