Selenium Absorption by Excised Astragalus Roots |
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Authors: | Jane M Ulrich and Alex Shrift |
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Institution: | aLaboratory of Comparative Biology, Kaiser Foundation Research Institute, Richmond, California |
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Abstract: | Absorption of selenate and selenite by excised roots of Astragalus Crotalariae, a selenium accumulator, and of A. lentiginosus, a non-accumulator, was favored by CaCl(2) and a pH of 4.0. The uptake of selenate and possibly selenite, is metabolically linked. Roots of a number of Astragalus species were examined, and in all cases selenate entered the roots much faster than selenite. In these short-term experiments there was no relation between uptake of the 2 ions and classification of a species as selenium-accumulator or non-accumulator. |
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