Effects of External KCl on Electrical Properties and K$(86Rb) Transport in the Elongating Region of Intact Phaseolus mungo Roots |
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Authors: | Ishikawa, Hideo Matsuura, Keitaro Yamamura, Sadao Ohta, Eiji Sakata, Makoto |
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Affiliation: | Department of Instrumentation Engineering, Faculty of Science and Technology, Keio University Kohoku-ku, Yokohama 223, Japan |
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Abstract: | Two simultaneous measurements, extracellular potential V andK$(86Rb) transport, and the intracellular potential of corticalcell E and potential V, were used to study the effects of externalKCl on two-day-old bean roots. High, external KCl concentrations(>10 mM) markedly enhanced K$ loss from tissues in the elongatingregion to the external solution and induced depolarization ofthe membrane potential difference (PD=VE). When Phaseolus roots were returned to a solution with a lowerconcentration of K$, the K$ loss and the potential difference,PD, were restored to their previous values. K$ transport fromother parts of the root to the elongating region, however, didnot recover, and the potential, E, increased. These resultsclearly demonstrate that treatment of Phaseolus roots with ahigh external K$ concentration inhibits K$ translocation throughthe stele to the elongating cortical cells and is dependenton depolarization of the intracellular potential. (Received October 14, 1983; Accepted January 20, 1984) |
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