The Potassium Relations of Lemna minor L.: II. THE MECHANISM OF POTASSIUM UPTAKE |
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Authors: | YOUNG, M. SIMS, A. P. |
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Abstract: | The experiments described in this paper concern the nature ofthe K+-influx mechanism in Lemna minor L. It is establishedthat K+ influx is site restricted and that theaffinity of the system involved is in close agreement with thatof the well-documented System I mechanisms that are found inmany plants (Epstein, 1972). Experiments with ATP and CCCP suggestthat K+ influx is an active process, that the influx machineryresides at the plasmalemma and that this machinery containsan ATPase activity. Membrane vesicles isolated from the plantsabsorb K+(Rb+) with an affinity comparable to that of the systeminvolved in physiological K+ influx. |
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