Abstract
1. 1. Outward currents of the plasmalemma of tonoplast-free cells of N. obtusa were investigated. 2. 2. The cation channels through which these currents pass were shown to be permeable for monovalent cations: Rb + > K + > Cs + > Na + and for divalent cations: Ca 2+ > Sr 2+ > Mg 2+ > Ba 2+. 3. 3. Ca 2+ blocked the outward currents. 4. 4. The blockers of Ca 2+ channels: verapamil, D600, diltiazem also blocked these channels. 5. 5. Micromolar Ba 2+ concentrations introduced to the cell abolished the self-blocking of intracellular Na + ions and increased the conductance.
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