54Mn Incorporation into Plants and Subsequent Metabolism by Rats
1972
Lassiter, J. W. | Coston, M. L. | Miller, W. J. | Morris, H. D.
Little information was available on metabolism by animals of Mn in chemical forms existing in plants. Incorporation of ⁵⁴Mn into plants is a practical way to facilitate such studies; however, before this could be done, studies were required on factors affecting ⁵⁴Mn uptake by plants. Accordingly, the influence of dose levels and dose-date and harvest-date on ⁵⁴Mn uptake by four plant species were studied. Also, the absorption by rats of the ⁵⁴Mn incorporated into plants was studied. Increasing ⁵⁴Mn dose level from 0.86 to 8.6 and 86 µCi decreased uptake. Applying the dose 19 days after planting increased ⁵⁴Mn uptake, as compared to applying it 12 days after. Uptake by soybeans [Glycine max (L.) Merrill] was higher than by corn (Zea mays L.), millet (Panicum sp.), or sorghum [Sorghum bicolor (L.) Moench] ✕ sudan (Sorghum vulgare sudanense), especially at the lowest dose level. Livers of weanling male rats fed Mn forage contained only one-third as much ⁵⁴Mn as those of rats given ⁵⁴MnCl₂. Similar effects were evident in kidneys and duodenum. Thus, Mn in forage was much less available to rats than Mn as the chloride illustrating the importance of chemical form of Mn on its metabolism and value to animals.
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