Effect of Adsorbed Cations on Phosphorus Absorption by Various Plant Species1

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Abstract
P uptake by excised roots of 10 different plant species was found to be stimulated by a short pretreatment with polyvalent cations, or by raising the ionic strength of the absorbing solution.The pretreatment consisted of a l‐min rinse with 10−3 N chloride salt solutions prior to exposure to 2 × 10−5 M KH2PO4. Also, the root CEC was estimated by isotopic exchange using a labeled CaCl2 solution. The stimulation of P uptake by the polyvalent cation pretreatments was significantly correlated with the amount of P taken up by the control and the root cation exchange capacities. The results supported the hypothesis that the cell wall can act act as a negatively charged membrane regulating P uptake.

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