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Potassium fluxes in excised barley hordeum distichon cultivar kocherperle roots

Potassium fluxes in excised barley hordeum distichon cultivar kocherperle roots

Journal of Experimental Botany 35(135): 584-600

ISSN/ISBN: 0022-0957

The method of the modified compartmental analysis for excised roots was adopted for measuring K+-fluxes and compartmentation in barley (H. distichon) roots. Efflux of 42K and 86Rb indicated that more than 2 intracellular compartments were involved in the tracer exchange; the 42K data clearly showed the components. On the basis of the efflux behavior of the apical and more basal tissues of the roots, the 3 components of efflux were attributed to the cytoplasm of differentiated (fast) and meristematic tissues (intermediate) and to the vacuoles (slow exchange) of the roots. A model is proposed on the basis of which, the fluxes corresponding to the meristematic and differentiated tissues of the root can be estimated. Fluxes of the differentiated root tissues were determined by using efflux data obtained with root segments without apical tissues. Comparison of the 42K and 86Rb efflux data show strong discrimination of K+ in flavor of Rb+ and indicate that 86Rb is not suitable as a tracer for K+ in efflux measurements, at least with barley roots.

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Accession: 006156197

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