首页|期刊导航|中国农业科学（英文版）|Genotypic Difference in the Responses of Seedling Growth and Cd Toxicity in Rice (Oryza sativa L.)
中国农业科学（英文版）2006，Vol.5Issue(1)：68-76,9.
Genotypic Difference in the Responses of Seedling Growth and Cd Toxicity in Rice (Oryza sativa L.)
Genotypic Difference in the Responses of Seedling Growth and Cd Toxicity in Rice (Oryza sativa L.)
摘要
Abstract
The experiment was carried out to study the genotypic difference in the responses of seed germination, growth and physiological characters of rice seedlings to Cd toxicity. The result showed that the germination was slightly stimulated under low Cd concentration (0.01-1.5 mM Cd), while severely depressed under higher Cd concentration (2.0 mM). Rice seedlings exposed to 0.01 mM Cd showed slight increases in plant height, root volume, biomass and chlorophyll concentration. These parameters were significantly reduced when Cd level in the medium was increased to 0.5 mM, and meanwhile corresponding increase in superoxide dismutase (SOD) and peroxidase (POD) activities, and MDA (malondialdehyde) content was observed. However, SOD and POD activities declined when plants were exposed to 1 mM Cd when compared with those under 0.5 mM Cd. Cadmium addition lowered Fe, Cu and Mn concentrations in roots and shoots. There was significant genotypic difference in the response of these parameters to Cd stress. Under Cd stress, Xiushui 110 had the least inhibition of growth and increase in MDA content, higher shoot Cd concentration, and greatest increase in POD and SOD activities, indicating its higher tolerance to Cd toxicity, while Bing 9914 had the greatest reduction of growth, and Zn, Cu, Fe, and Mn contents, but greatest increase in MDA content, and least increase in activities of antioxidative enzymes, indicating its sensitivity to Cd toxicity.关键词
anti-oxidative enzyme/cadmium/chlorophyll/germination/nutrition/rice (Oryza sativa L.)Key words
anti-oxidative enzyme/cadmium/chlorophyll/germination/nutrition/rice (Oryza sativa L.)分类
农业科技引用本文复制引用
WU Fei-bo,DONG Jing,JIA Guo-xia,ZHENG Shan-jiu,ZHANG Guo-ping..Genotypic Difference in the Responses of Seedling Growth and Cd Toxicity in Rice (Oryza sativa L.)[J].中国农业科学（英文版）,2006,5(1):68-76,9.基金项目
We are deeply indebted to the Key Program of Zhejiang Natural Science Foundation, China (Z304104) for its support for this project. （Z304104）
