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Effect of Exchangeable Cations on Lateral Movement of Sulfate in Excised Roots¹

ABSTRACT

Autoradiographs of histologic sections from excised corn (Zea mays) roots exposed to ³⁵S labeled SO₄^2- after pretreatment with K⁺, Ca²⁺, or Al³⁺ are shown. The autoradiographs indicate that the permeability of the epidermal layer to sulfate is severely restricted when pretreated with K⁺ but not when pretreated with Ca²⁺ or Al³⁺. Apparently this effect is associated with the cation exchange sites located in or near the epidermal layer and results from the electrostatic repulsive forces opposing anions which approach the epidermis, where the negatively charged sites are first encountered. The repulsive force would be an inverse function of the degree neutralization of the exchange sites by adsorbed cations which is in the order Al³⁺ > Ca²⁺ > K⁺.

¹ Published with permission of the Director of the Ohio Agricultural Research & Development Center as Journal Article No. 55–72.

² Professor, The Ohio State Univ. and Ohio Agr. Res. and Develop. Cen., 1885 Neil Ave., Columbus. The author is now on a leave of absence.

Received for publication January 2, 1973. Accepted for publication February 19, 1973.