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Plant Physiology 44:1639-1644 (1969)
© 1969 American Society of Plant Biologists

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Articles

Role of the Accompanying Anion in the Effect of Calcium Salts on Potassium Uptake by Excised Barley Roots

Toshiaki Tadano1, J. H. Baker and Mack Drake

a Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01002

The effect of addition of Ca salts on accumulation of K from 5 mN KCl or K2SO4 solutions was found to depend on whether Ca was added as Cl or SO4 salt. Chloride as well as K uptake was increased when Ca and Cl concentrations in culture solutions were increased. Pre-treatment of roots with CaCl2 stimulated subsequent K uptake from K2SO4 solutions as compared to pre-treatment with distilled water but pre-treatment with CaSO4 did not. The results indicate that addition of Ca salts to KCl or K2SO4 solutions increased anion uptake and the effect of the addition of the Ca salts on K uptake was in part the result of increased anion uptake and not entirely a direct effect of Ca.

In contrast, accumulation of Na and K from solutions containing these ions as SO4 or Cl salts was changed from preferential uptake of Na to preferential uptake of K by addition of either CaCl2 or CaSO4. Thus, while Ca salts may influence K accumulation partly as a result of effects on anion uptake, the selectivity for K uptake depends on the presence of Ca and is influenced little by the accompanying anion.

1 Present Address: Department of Agricultural Chemistry, Hokkaido University, Kita-9, Sapporo, Japan.






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Copyright © 1969 by the American Society of Plant Biologists