Abstract
Studies on the rate of iron absorption by excised rice roots from solutions of different concentrations of FeSO4 showed the presence of two patterns, one in the low (0.005-0.5 mM) and the other in the high (1-30 mM) concentration range. The presence of CaSO4 or MnSO4 at 0.5 mM enhanced Fe(++) absorption in the low concentration range, while CaSO4 at 10 mM inhibited Fe absorption in the high concentration range in a competitive manner. Fe(++) absorption at both low and high concentrations was sensitive to metabolic inhibitors. The isotherm for Fe(++) absorption at O° exhibited an initial absorption shoulder in both low and high concentrations and was suggestive of a latent ion-transport capacity for Fe(++) in rice roots.
Published Version
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