| 重金属镉对水稻根毛细胞钾离子吸收过程的影响 |
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| 引用本文： | 李隼,黄胜东,赵福庚. 重金属镉对水稻根毛细胞钾离子吸收过程的影响[J]. 植物生理学通讯, 2011, 0(5): 481-487 |
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| 作者姓名： | 李隼 黄胜东 赵福庚 |
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| 作者单位： | 南京大学生命科学学院;江苏省农业科学院粮食作物研究所; |
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| 基金项目： | 江苏省自然科学基金(BK2010388); 林业公益性行业科研专项经费(200904001) |
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| 摘 要： | 重金属镉进入植物体后会引起一系列的毒害反应,然而迄今为止有关镉毒害的机制并不明了。本研究综合使用了膜电势测定、非损伤微测和膜片钳等电生理学实验技术,检测了镉对水稻根毛细胞钾离子吸收过程的影响。研究结果显示,外源施用50μmol·L-1 CdCl2能明显造成水稻根毛细胞膜的去极化,抑制根毛细胞质膜内向K＋通道活性,同时诱导外向K＋通道开放,导致根系内K＋外渗,进而降低了水稻根部K＋含量。通过上述影响,镉扰乱了水稻根系对钾离子的吸收过程,造成钾元素缺失,成为植物体镉毒害作用的机理之一。
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| 关 键 词： | 水稻 重金属镉 钾离子吸收 |
Effects of Cadmium on K~+ Uptake in Root Hair Cells of Rice |
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| LI Sun,HUANG Sheng-Dong,ZHAO Fu-Geng,School of Life Sciences,Nanjing University,Nanjing ,China. Effects of Cadmium on K~+ Uptake in Root Hair Cells of Rice[J]. Plant Physiology Communications, 2011, 0(5): 481-487 |
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| Authors: | LI Sun HUANG Sheng-Dong ZHAO Fu-Geng School of Life Sciences Nanjing University Nanjing China |
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| Affiliation: | LI Sun1,HUANG Sheng-Dong2,ZHAO Fu-Geng1,*1School of Life Sciences,Nanjing University,Nanjing 210093,China,2Institute of Food Crops,Jiangsu Academy of Agricultural Sciences,Nanjing 210014 |
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| Abstract: | It has been widely documented that Cd entering plants will cause a series of detrimental consequences,but the mechanisms of Cd toxicity are not clearly understood.Using biophysical techniques including membrane potential measurements,SIET(scanning ion-selective electrode technique) for non-invasive ion flux assays,and patch clamp,we monitored the effect of Cd on potassium(K+) uptake in root hair cells of rice.Our results showed that K+ contents in roots were significantly reduced when treated with exogenous... |
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| Keywords: | rice cadmium potassium uptake |
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