Two simultaneous measurements, extracellular potential V and K$(86Rb) transport, and the intracellular potential of cortical cell E and potential V, were used to study the effects of external KCl on two-day-old bean roots. High, external KCl concentrations (>10 mm) markedly enhanced K$ loss from tissues in the elongating region to the external solution and induced depolarization of the membrane potential difference (PD=V-E).When Phaseolus roots were returned to a solution with a lower concentration of K$, the K$ loss and the potential difference, PD, were restored to their previous values. K$ transport from other parts of the root to the elongating region, however, did not recover, and the potential, E, increased. These results clearly demonstrate that treatment of Phaseolus roots with a high external K$ concentration inhibits K$ translocation through the stele to the elongating cortical cells and is dependent on depolarization of the intracellular potential.
|ジャーナル||Plant and Cell Physiology|
|出版ステータス||Published - 1984 4|
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