| Membrane-Potential Alteration During K＋ Uptake of Different Salt-Tolerant Wheat Varieties |
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| 作者单位： | WANG Yu-qian(Key Laboratory of Crop Genetics and Physiology of Jiangsu Province,Yangzhou University,Yangzhou 225009,P.R.China ;School of Life Sciences,Guizhou Normal University,Guiyang 550001,P.R.China);WANG Xiao-li,SHAN Yu-hua,SHENG Hai-jun,FENG Ke(Key Laboratory of Crop Genetics and Physiology of Jiangsu Province,Yangzhou University,Yangzhou 225009,P.R.China) |
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| 基金项目： | Acknowledgements This work was supported by the National Natural Science Foundation of China （30671240, 30871588） and the National Basic Research Program of China （973 Program of China, 2007CB 109303）. |
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| 摘 要： | K＋ is the most abundant cation in plant cells and plays an important role in many ways.K＋ uptake of plant has respect to its salt resistant capacity.There are two categories of channel transportation for plants to uptake K＋,one is through K＋ channels and the other is through nonselective cation channels（NSCCs）.The transmembrane localization of K＋ may change membrane potential（MP）.In this paper,three wheat varieties with different salt tolerance were selected and the MP was measured by microelectrode during K＋ uptake.The results showed that the effects of K＋ uptake on MP through K＋ channels or NSCCs were distinct.K＋ influx through K＋ channels led to MP hyperpolarization,while K＋ influx through NSCCs resulted in depolarization.Diverse MP alteration of wheat varieties with different salt tolerance was mainly due to NSCCs-mediated K＋ uptake.Compared with the salt-tolerant wheat,the MP hyperpolarization during K＋ uptake of saltsensitive wheat was much more evident,probably because of the cation outflux through NSCCs during this process.
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| 关 键 词： | 小麦品种 钾吸收 耐盐性 膜电位 非选择性阳离子通道 植物细胞 抗盐能力 运输通道 |
| 收稿时间： | 7 July 2009 |
Membrane-Potential Alteration During K+ Uptake of Different Salt-Tolerant Wheat Varieties |
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| Authors: | WANG Yu-qian WANG Xiao-li SHAN Yu-hua SHENG Hai-jun FENG Ke |
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| Institution: | 1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province,Yangzhou University,Yangzhou 225009,P.R.China ;School of Life Sciences,Guizhou Normal University,Guiyang 550001,P.R.China
2. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province,Yangzhou University,Yangzhou 225009,P.R.China |
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| Abstract: | K+ is the most abundant cation in plant cells and plays an important role in many ways.K+ uptake of plant has respect to its salt resistant capacity.There are two categories of channel transportation for plants to uptake K+,one is through K+ channels and the other is through nonselective cation channels(NSCCs).The transmembrane localization of K+ may change membrane potential(MP).In this paper,three wheat varieties with different salt tolerance were selected and the MP was measured by microelectrode during K+ uptake.The results showed that the effects of K+ uptake on MP through K+ channels or NSCCs were distinct.K+ influx through K+ channels led to MP hyperpolarization,while K+ influx through NSCCs resulted in depolarization.Diverse MP alteration of wheat varieties with different salt tolerance was mainly due to NSCCs-mediated K+ uptake.Compared with the salt-tolerant wheat,the MP hyperpolarization during K+ uptake of saltsensitive wheat was much more evident,probably because of the cation outflux through NSCCs during this process. |
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| Keywords: | wheat K+ uptake nonselective cation channels(NSCCs) membrane-potential |
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