生态与农村环境学报2012，Vol.28Issue(6)：687-693,7.
膨润土对镉胁迫下水稻幼苗生理生化特性的影响
Effects of Bentonite on Physiological and Biochemical Characteristics of Rice Seedlings Under Cd Stress
摘要
Abstract
A pot experiment was conducted to explore effects of bentonite on physiological and biochemical characteristics , such as chlorophyll content, shoot biomass, SOD and POD activities, and MDA content of rice seedlings growing in Cd contaminated soil. Results show that the amendment of bentonite increased the content of chlorophyll in leaves of the rice seedlings and promoted growth and development of the seedlings. The dry biomass of rice shoots increased with rising bentonite application rate. In the soil contaminated only with Cd, SOD activity remained almost unchanged in leaves of the rice seedlings, but did significantly in roots of the plants, SOD lowered with rising Cd concentration in the soil ( P < 0. 05 ) , and application of bentonite increased SOD activity in the roots as a whole. However, POD activities in leaves and roots of the plants rose sharply first and then declined with the increase in Cd concentration in the soil treated only with Cd. Application of bentonite reduced POD activity in leaves of the plants. However, the application of 5 -50 g · kg bentonite significantly increased POD activity in roots of the rice seedlings, by 13.2% - 22.4% , 4.9% - 9.5% , 44. 8% -80. 6% , and 6.9% -49. 6% , respectively, over that in the control. MDA contents in leaves and roots of the plants rose with rising Cd concentration and were 139. 0% and 158. 1% higher, respectively than that in control. Application of bentonite significantly lowered MDA contents in the rice, and weakened the effect of membrane lipid peroxidation. To sum up, application of bentonite can effectively alleviate Cd toxicity to rice seedlings, thus it can be used as an approach to the remediation of Cd contaminated soils.关键词
水稻/膨润土/Cd/生理生化特性Key words
rice/bentonite/Cd/physiological and biochemical characteristics分类
资源环境引用本文复制引用
史新,徐应明,谢忠雷,孙约兵,胡发志..膨润土对镉胁迫下水稻幼苗生理生化特性的影响[J].生态与农村环境学报,2012,28(6):687-693,7.基金项目
国家自然科学基金(21107056,21177068) （21107056,21177068）
公益性行业(农业)科研专项(201203045) （农业）
农业部产地环境质量重点实验室开放基金 （）
