Alteration of Ion Channels in the Plasmalemma of Nitella flexilisCells during Long-Term Hyperthermia

Alteration of Ion Channels in the Plasmalemma of Nitella flexilisCells during Long-Term Hyperthermia The conventional microelectrode technique was applied to study changes in conductance and activation characteristics of potassium and chloride channels in the plasmalemma of characean alga Nitella flexilis(L.) Agardz. during long-term heat treatment. Measurements were conducted at 18–20°C after preliminary exposure of cells to 33°C for 1–25 days. The conductance of outward- and inward-rectifying potassium channels, as well as the currents of excitable chloride channels, decreased after 2–3 days of heat treatment. By the 15th–17th days, the conductance of potassium channels was reduced by a factor of 3–5, whereas the peak values of the chloride current, associated with the action potential, was reduced by a factor of 8–10. These heat-induced changes were long lasting: the restoration of the initial parameters of transport systems after transferring cells to chilling or room temperature occurred within several days. Moreover, the recovery at chilling temperatures (8–10°C) proceeded nearly two times longer than at room temperature. Prolonged hyperthermia accelerated activation and deactivation of outward-rectifying potassium channels and caused the shift of their activation curve towards positive potentials by 35–40 mV. Analysis of current–voltage relations showed that the inward current in inward- and outward-rectifying potassium channels was reduced to a greater extent than the outward current. At the same time, both inward and outward currents of chloride channels were reduced to an equal extent. It is assumed that the changes observed are involved in thermal adaptation and account for the decrease in the intracellular concentrations of potassium and other cations and anions, which represents a nonspecific response of plant cells to stress. Russian Journal of Plant Physiology Springer Journals

Alteration of Ion Channels in the Plasmalemma of Nitella flexilisCells during Long-Term Hyperthermia

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2001 by MAIK “Nauka/Interperiodica”
Life Sciences; Plant Sciences
Publisher site
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