Kinetics of Rb Absorption by Excised Barley Roots under Changing Rb Concentrations. I. Effects of Other Cations on Rb Uptake

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Abstract
The time-course of Rb absorption by barley roots was studied by following its concentration changes and amounts taken up at various intervals. In the absence of interfering ions, the quantity of Rb disappearing from the solution agreed with that taken up by the roots. K ions reduced equally the amount of Rb disappearing from the solution and that absorbed by the roots, resulting in both values showing good agreement. In the presence of Na, Ca, or Mg ions, however, Rb disappearance and absorption into roots did not agree; less Rb was taken into roots than that disappearing from the solution. A postulate involving a chain of negative sites as a possible pathway for cation entry into root cells is given to explain the results.

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