Summary
At membrane potentials different fromE K, the temperature effect on membrane potential ofNitella consists of two components. One of them changes its sign atE K, the other one does not. This leads to the assignment of these components to changes in the K+ channel and in the H+ pump, respectively. It is shown that the fast time constant (3 to 30 sec) of the temperature effect on the H+ pump measured as a change in membrane potential and that of the temperature effect on the K+ channel measured as a change in resistance (having about twice the value of that of the pump) are sensitive to light intensity. Both time constants measured inNitella become smaller if light intensity increases from 0 to 15 Wm−2. This supports the suggestion of Fisahn and Hansen (J. Exp. Bot. 37:440–460, 1986) that temperature acts on plasmalemma transport via photosynthesis via the same mechanism as light does.
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Stein, S., Hansen, UP. Involvement of photosynthesis in the action of temperature on plasmalemma transport inNitella . J. Membrain Biol. 103, 149–158 (1988). https://doi.org/10.1007/BF01870945
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DOI: https://doi.org/10.1007/BF01870945