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当前位置: 首页 > 文章 > 盐胁迫下沙冬青和绿豆根冠细胞膜电位的原初响应研究 北京林业大学学报 2008,30 (6) 16-21
Position: Home > Articles > Primary response of plasma membrane potential on root caps of Ammopiptanthus mongolicus and Phaseolus radiatus to salt stress Journal of Beijing Forestry University 2008,30 (6) 16-21

盐胁迫下沙冬青和绿豆根冠细胞膜电位的原初响应研究

作  者：
闫慧;夏新莉;高荣孚;尹伟伦
单  位：
北京林业大学生物科学与技术学院
关键词：
膜电位;微电极;盐胁迫;原初响应;沙冬青
摘  要：
该文以沙冬青、绿豆为材料,利用微电极技术实时记录了活体沙冬青和绿豆根冠细胞膜电位对不同盐分的原初响应,分析了质膜转运蛋白抑制剂(Vanadate、TEA)对植物根冠细胞膜电位的影响。结果表明:50、100、200 mmol/LNaCl、KCl和LiCl均会引起植物细胞膜电位去极化。对于同一阳离子而言,去极化程度随处理液中离子浓度的增加而加强;对于同一浓度、不同阳离子而言,由于水合离子半径大小不一(K+Na+>Li+),因此引起膜电位的去极化程度也存在差异(K+>Na+>Li+);同一阳离子且同一浓度下对于不同植物来说,绿豆根冠细胞膜电位去极化程度大于沙冬青,即单位时间绿豆根对Na+的通透性大于沙冬青。质膜H+--ATPase和K+通道参与了沙冬青和绿豆在盐胁迫时的原初响应,K+通道可能参与了Na+的跨膜转运。
译  名：
Primary response of plasma membrane potential on root caps of Ammopiptanthus mongolicus and Phaseolus radiatus to salt stress
作  者：
YAN Hui;XIA Xin-li;GAO Rong-fu;YIN Wei-lun.College of Biological Sciences and Biotechnology,Beijing Forestry University,100083,P.R.China.
关键词：
plasma membrane potential;microelectrodes;salt stress;primary response;Ammopiptanthus mongolicus
摘  要：
Changes of the plasma membrane potential on root caps of Ammopiptanthus mongolicus and Phaseolus radiatus were real-time recorded using microelectrodes under different univalent cations.Influences of different plasma membrane transport protein inhibitors(Vanadate,TEA)on the membrane potential in the root cap of A.mongolicus and P.radiatus had also been studied.The results showed that different univalent cations(50,100,200 mmol/L)uptake by the roots made plasma membrane potential depolarized.For the same cation,firstly,the magnitude of depolarization increased with the rising of univalent cation concentrations.Secondly,in the condition of different cations with the same concentration,univalent cations have various hydrated radius(K~+Na~+>Li~+).Thus,the magnitude of depolarization was also different(K~+>Na~+>Li~+).Finally,in terms of different plants with the same cation and concentration,P.radiatus has higher magnitude of depolarization than A.mongolicus.Namely,Na~+ uptake by the roots of P.radiatus was stronger than that of A.mongolicus.H~+-ATPase and K~+ channel are involved in the primary response of salt tolerance.K~+ channel may be a way that Na~+ transits into root.

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