Planta

, Volume 126, Issue 1, pp 61–73

Relation between permeability to potassium and sodium ions and fusicoccin-stimulated hydrogen-ion efflux in barley roots

  • M. G. Pitman
  • N. Schaefer
  • R. A. Wildes
Article

DOI: 10.1007/BF00389360

Cite this article as:
Pitman, M.G., Schaefer, N. & Wildes, R.A. Planta (1975) 126: 61. doi:10.1007/BF00389360

Summary

Measurements are described of fusicoccin (FC)-stimulated H+ efflux in barley (Hordeum vulgare L.) roots when K+ and Na+ concentrations were varied. In low-salt roots H+ efflux was stimulated in both 5 mM KCl and NaCl. In salt-saturated roots H+ efflux was stimulated more effectively in KCl than in NaCl solution. The stimulation of H+ efflux thus is parallel with the selectivity of these different root preparations for K+ and Na+ and with estimates of permeability ratios (PNa/PK) determined from electrical measurements. It is suggested that the results support electrogenic coupling between FC-stimulated H+ efflux and cation uptake.

Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • M. G. Pitman
    • 1
  • N. Schaefer
    • 1
  • R. A. Wildes
    • 1
  1. 1.School of Biological SciencesUniversity of SydneyAustralia