Effects of external KCl on electrical properties and K$(86Rb) transport in the elongating region of intact phaseolus mungo roots

Hideo Ishikawa, Keitaro Matsuura, Sadao Yamamura, Eiji Ohta, Makoto Sakata

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)359-365
Number of pages7
JournalPlant and Cell Physiology
Volume25
Issue number3
Publication statusPublished - 1984 Apr

Keywords

  • Elongating region
  • Extracellular potential
  • Intracellular potential
  • Phaseolus
  • Potassium

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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