Accumulation of potassium and sodium by barley roots in a k-na replacement series |
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Authors: | Hiatt A J |
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Institution: | Department of Agronomy, University of Kentucky, Lexington, Kentucky 40506. |
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Abstract: | Excised roots of barley (Hordeum vulgare, var. Campana) were incubated for 24 hr in solutions containing constant total concentrations of KCl and NaCl but in which the mole fractions of K and Na were varied in replacement series. In solutions containing 1, 10, or 50 mm concentrations of K+ plus Na+, total cation accumulation was dependent upon the total salt concentration but was relatively independent of the mole fractions of K+ and Na+. These results imply that accumulation of K+ and Na+ was limited by a common factor. In solutions containing 0.01 mm K+ plus Na+ there was a strong preference for K+ over Na+ and the sum of K+ and Na+ accumulation increased with increasing K+ concentration. |
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