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Articles

Influence of Calcium and Magnesium on Manganese Absorption ¹

^a Department of Soils, Oregon State University, Corvallis, Oregon 97331

Mutual effects between Mn, Ca, and Mg were studied during steady-state absorption experiments with excised barley roots. Calcium appeared to enhance the rate of Mn absorption; whereas, Mg had a highly depressive effect. The combination of both Ca and Mg was even more inhibitory to Mn absorption than Mg alone. Manganese had no effect on the usual negligible Ca absorption by this tissue, but effectively inhibited the absorption of Mg. Although divalent cation absorption from the Ca-Mg-Mn system was essentially nil, K absorption was greatly stimulated in the presence of these cations.

These mutual effects and others reported in the literature are explained by the hypothesis that selectivity in ion absorption results from cation-induced conformational changes in the structure of the carrier molecule.

³ Present Address: United States Public Health Service, S. W. Radiological Health Laboratory, 4505 Md., Parkway 00, Las Vegas, Nevada 89101.

¹ This technical paper No. 2528 of the Oregon Agricultural Experimental Station is based on work performed under contract No. AT (45-1)-1547 with the United States Atomic Energy Commission.