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Correlations between Potassium Uptake and Hydrogen Efflux in Barley Varieties ¹

A POTENTIAL SCREENING METHOD FOR THE ISOLATION OF NUTRIENT EFFICIENT LINES

Department of Botany, University of British Columbia, Vancouver, British Columbia V6T 2B1 Canada

Rates of hydrogen ion secretion and potassium (⁸⁶Rb) absorption by intact roots of twenty-four barley varieties were measured in solutions containing K₂SO₄ (1 x 10^–4 to 1 x 10^–3 molar) plus 5 x 10^–4 molar CaSO₄, at initial pH values in the range 5.3 to 5.5. Fluxes of H⁺ and K⁺ were strongly correlated in short-term experiments (up to 15 minutes) as well as in long-term experiments (lasting 24 hours). The observed correlations provide the basis for a preliminary screening method, designed to segregate varieties with high rates of potassium uptake by the use of an acid-base indicator (methyl red).