Metabolism of Na275SeO4inAstragalus bisulcatusLima Bean, and Wheat: a Comparative Study

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Abstract
A comparative study of the metabolism of Na275SeO4 in Astragalus bisulcatus, luma bean, and wheat has been carried out. The results indicate that all three plants metabolize selenium extensively. Important differences were observed in the distribution of radioactivity between the various fractions isolated from the plants. Compared to the protein fraction, the free amino acid fraction from A. bisulcatus contained a higher percentage of radioactivity. The converse was true for wheat and lima bean. As A. bisulcatus proteins contained a significant percentage of radioactivity, it is suggested, that the differences in the toxicity of selenium towards wheat, lime bean, and A. bisulcatus are difficult to explain in terms of the differences in its incorporation into the protein of the three species.