Maas E V, Moore D P, Mason B J
Plant Physiol. 1969 Jun;44(6):796-800. doi: 10.1104/pp.44.6.796.
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.
在对离体大麦根进行的稳态吸收实验中，研究了锰、钙和镁之间的相互作用。钙似乎能提高锰的吸收速率；而镁则有很强的抑制作用。钙和镁的组合对锰吸收的抑制作用甚至比单独的镁更强。锰对该组织通常可忽略不计的钙吸收没有影响，但能有效抑制镁的吸收。虽然从钙 - 镁 - 锰体系中吸收二价阳离子基本为零，但在这些阳离子存在的情况下，钾的吸收受到极大促进。文献中报道的这些相互作用及其他情况，可通过离子吸收的选择性源于阳离子诱导载体分子结构构象变化这一假说来解释。
