| Genotypic Difference in the Responses of Seedling Growth and Cd Toxicity in Rice （Oryza sativa L.） |
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| 作者姓名： | WU Fei-bo DONG Jing JIA Guo-xia ZHENG Shan-jiu ZHANG Guo-ping |
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| 作者单位： | Department of Agronomy, Huajiachi Campus, Zhejiang University, Hangzhou 310029, P.R.China |
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| 基金项目： | Acknowledgements We are deeply indebted to the Key Program of Zhejiang Natural Science Foundation, China （Z304104） for its support for this project. |
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| 摘 要： | 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.
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| 关 键 词： | 水稻 基因多样性 种子 品种资源 农艺性状 |
| 收稿时间： | 2005-04-07 |
| 修稿时间： | 2005-07-06 |
Genotypic Difference in the Responses of Seedling Growth and Cd Toxicity in Rice (Oryza sativa L.) |
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| 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].Agricultural Sciences in China,2006,5(1):68-76. |
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| Authors: | Fei-bo WU Ph D Professor Jing DONG Guo-xia JIA Shan-jiu ZHENG Guo-ping ZHANG |
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| Institution: | Department of Agronomy, Huajiachi Campus, Zhejiang University, Hangzhou 310029, P.R. China |
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| 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. |
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| Keywords: | anti-oxidative enzyme cadmium chlorophyll germination nutrition rice (Oryza sativa L ) |
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