Blockade of potassium channels in the plasmalemma ofChara corallina by tetraethylammonium, Ba2+, Na+ and Cs+

@article{Tester2005BlockadeOP,
  title={Blockade of potassium channels in the plasmalemma ofChara corallina by tetraethylammonium, Ba2+, Na+ and Cs+},
  author={Mark Tester},
  journal={The Journal of Membrane Biology},
  year={2005},
  volume={105},
  pages={77-85}
}
The outer membranes of plant cells contain channels which are highly selective for K+. In the giant-celled green algaChara corallina, K+ currents in the plasmalemma were measured during the action potential and when the cell was depolarized to the K+ equilibrium potential in high external K+ concentrations. Currents in both conditions were reduced by externally added tetraethylammonium (TEA+), Ba2+, Na+ and Cs+. In contrast to inhibition by TEA+, the latter three ions inhibited inward K… CONTINUE READING