Effects of La^(3+) and Eu^(3+) on outward potassium channels in Vicia guard cells  

作　　者：XUE ShaoWu & YANG Pin Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education,Institute of Molecular Science,Shanxi University,Taiyuan 030006,China 

出　　处：《Science China Chemistry》2009年第11期1821-1824,共4页中国科学（化学英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 20701028)

摘　　要：Effects of La3+ and Eu3+ on outward potassium channels(K+out) in Vicia guard cells have been studied by patch clamping technique.Extracellular La3+ inhibited K+out currents with a half-inhibition concentration(IC50) of 81 μmol·L-1.Interestingly,intracellular La3+ activated K+out currents at a free concentration of 1.13 × 10-14 mol·L-1,and inhibited K+out currents at a free concentration of 5.86 × 10-14 mol·L-1.Extracellular Eu3+ also activated K+out currents at concentrations of 10 μmol·L-1 and 50 μmol·L-1,and inhibited K+out currents at concentrations of more than 1 mmol·L-1.The effects of La3+ and Eu3+ on K+out currents may contribute to regulation of the plant water status,which may be one of the mechanisms of the biological effect of rare earth elements.Effects of La3+ and Eu3+ on outward potassium channels(K+out) in Vicia guard cells have been studied by patch clamping technique.Extracellular La3+ inhibited K+out currents with a half-inhibition concentration(IC50) of 81 μmol·L-1.Interestingly,intracellular La3+ activated K+out currents at a free concentration of 1.13 × 10-14 mol·L-1,and inhibited K+out currents at a free concentration of 5.86 × 10-14 mol·L-1.Extracellular Eu3+ also activated K+out currents at concentrations of 10 μmol·L-1 and 50 μmol·L-1,and inhibited K+out currents at concentrations of more than 1 mmol·L-1.The effects of La3+ and Eu3+ on K+out currents may contribute to regulation of the plant water status,which may be one of the mechanisms of the biological effect of rare earth elements.

关 键 词：RARE EARTH elements STOMATA GUARD cell outward POTASSIUM channel 

分 类 号：Q945[生物学—植物学]