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.
基金
Supported by the National Natural Science Foundation of China (Grant No. 20701028)
