• ISSN 1008-505X
  • CN 11-3996/S
王玉倩, 汪晓丽, 单玉华, 盛海君, 封克. 环境因素对小麦根系非选择性阳离子通道(NSCCs)转运钾的影响[J]. 植物营养与肥料学报, 2010, 16(4): 913-917. DOI: 10.11674/zwyf.2010.0420
引用本文: 王玉倩, 汪晓丽, 单玉华, 盛海君, 封克. 环境因素对小麦根系非选择性阳离子通道(NSCCs)转运钾的影响[J]. 植物营养与肥料学报, 2010, 16(4): 913-917. DOI: 10.11674/zwyf.2010.0420
WANG Yu-qian, WANG Xiao-li, SHAN Yu-hua, SHENG Hai-jun, FENG Ke. Effects of environmental factors on nonselective cation channels-mediated potassium uptake of wheat roots[J]. Journal of Plant Nutrition and Fertilizers, 2010, 16(4): 913-917. DOI: 10.11674/zwyf.2010.0420
Citation: WANG Yu-qian, WANG Xiao-li, SHAN Yu-hua, SHENG Hai-jun, FENG Ke. Effects of environmental factors on nonselective cation channels-mediated potassium uptake of wheat roots[J]. Journal of Plant Nutrition and Fertilizers, 2010, 16(4): 913-917. DOI: 10.11674/zwyf.2010.0420

环境因素对小麦根系非选择性阳离子通道(NSCCs)转运钾的影响

Effects of environmental factors on nonselective cation channels-mediated potassium uptake of wheat roots

  • 摘要: 以石家庄8号小麦作为研究对象,通过添加钾载体抑制剂和钾专性通道抑制剂的方法,探讨了温度变化和重金属镉、铜对植物根系的非选择性阳离子通道(NSCCs)转运钾离子的影响。结果显示,NSCCs转运钾的最适温度在35℃左右,低温和高温都会使NSCCs的吸钾速率下降。较高的温度(40℃)对NSCCs转运钾的影响大于对专一性钾通道的影响; 而较低温度(20℃)对专一性钾通道活性的抑制比对NSCCs的抑制更强。重金属镉和铜均对小麦的钾吸收速率产生影响,浓度越大,抑制作用越强。其中,根系NSCCs对镉的敏感度相对于专一性钾通道来说要低,而对铜的敏感度相对较高。说明不同重金属对两类通道蛋白的影响机制不一样。

     

    Abstract: The nonselective cation channels(NSCCs)in plant roots contribute to the potassium transport across cell membrane. However, the ratioa of NSCCs-mediated K+ uptake to total K+ absorption by crops, and whether this process is affected by the environmental factors are still unknown. In this paper, the wheat cultivar Shijiazhuang 8 was used as material to study the effects of temperature and heavy metals(cadmium and copper)on K+ transport by NSCCs. The results show that the optimum temperature for NSCCs K+ uptake is about 35℃, and lower or higher temperature reduces the rate of K+ uptake by NSCCs. NSCCs-mediated K+ uptake is more sensitive to higher temperature(40℃)compared with the specific K+ channels, while NSCCs-mediated K+ uptake is more tolerant to lower temperature(20℃). The effects of cadmium and copper on NSCCs-mediated K+ uptake are dependent on their concentrations. Compared with the specific K+ channels, NSCCs are less sensitive to Cd2+ and more sensitive to Cu2+, which indicates that different heavy metals may influence the two types of channel proteins in different ways.

     

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