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Relation between permeability to potassium and sodium ions and fusicoccin-stimulated hydrogen-ion efflux in barley roots (1975)

Pitman, M. G. ; Schaefer, N. ; Wildes, R. A.

Springer

Planta 126 (1975), S. 61-73

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ISSN: 1432-2048

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: 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 (P Na/P K) determined from electrical measurements. It is suggested that the results support electrogenic coupling between FC-stimulated H+ efflux and cation uptake.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00389360

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