The regulation of K+ influx in excised barley roots |
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Authors: | Anthony D M Glass James Dunlop |
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Institution: | (1) Department of Botany, University of British Columbia, V6T 1W5 Vancouver, B.C., Canada;(2) Grasslands Division, DSIR, Palmerston North, New Zealand |
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Abstract: | The electrochemical potential differences
for potassium, between excised barley (Hordeum vulgare L.) roots and external media containing 0.05 mM KCl+0.5 mM CaSO4, were determined over a 4-h period during which initially low-K+ roots accumulated K+ by pretreatment in 50 mM KCl plus 0.5 mM CaCl2. This pretreatment resulted in increased internal K+], decreased K+ influx (as measured from 0.05 mM KCl+0.5 mM CaSO4) and decreased values of
. These observations indicate that the decline of K+ influx associated with increased internal K+ concentration cannot be accounted for by passive adjustment to the electrochemical gradient for this ion. |
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Keywords: | Electrochemical potentials Hordeum Ion influx (root) Potassium influx Potential (electrochemical) Root (ion influx) |
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