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  • Title: Potassium Fluxes during Potassium Absorption by Intact Barley Plants of Increasing Potassium Content.
    Author: Johansen C, Edwards DG, Loneragan JF.
    Journal: Plant Physiol; 1970 May; 45(5):601-3. PubMed ID: 16657351.
    Abstract:
    The presence of previously absorbed K in plants caused a marked reduction in the short term influx of (86)Rb-labeled K into roots of barley seedlings. The influx values agreed with net K absorption rates into intact plants, thus suggesting that K efflux was negligible in comparison with influx.Earlier interpretations of a large K efflux component from excised roots approaching equilibrium K concentrations are considered to be due to an underestimation of net K absorption rates resulting from xylem exudation as the K status of the roots increased.
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