Abstract
Internode disks of tomato (Lycopersicon esculentum cv. Moneymaker) were shaken in glutamine and sucrose solutions. At low external pH (<±5.5), the uptake of these substances was accompanied with K+ efflux, at high pH (>±5.5) with K+ influx. Low concentrations of external K+ (2 mmol l-1) stimulated the uptake of glutamine, which was strongly inhibited by the supply of high K+ concentrations (20 mmol l-1). The effect of K+ was particularly pronounced at high pH-values. Addition of CCCP in light reduced the uptake of glutamine to the same level as in the dark, and stopped the K+ fluxes which coincided with the uptake. A model is presented wherein the movements of K+ across the membrane are related to co-transport, depending on the membrane potential and the Nernst potential of K+.
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Abbreviations
- CCCP:
-
carbonylcyanide-m-chlorophenylhydrazone
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van Bel, A.J.E., van Erven, A.J. A model for proton and potassium co-transport during the uptake of glutamine and sucrose by tomato internode disks. Planta 145, 77–82 (1979). https://doi.org/10.1007/BF00379930
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DOI: https://doi.org/10.1007/BF00379930