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This article in SSSAJ

  1. Vol. 33 No. 4, p. 632-634
    Received: Feb 3, 1969
    Accepted: Apr 14, 1969

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Influence of Culture Filtrates of Soil Fungi on the Absorption of 144Ce and 90Sr by Excised Roots1

  1. A. A. Zwarun,
  2. R. H. Miller and
  3. R. E. Franklin2



Culture filtrates from Aspergillus niger, Aspergillus spp., and two species of Penicillium were studied for their effect on absorption of 144Ce and 90Sr by excised roots of soybean and barley. Filtrates from both species of Asperigllus and one of the Penicillium markedly decreased the absorption of 144Ce but had little effect on 90Sr. Citric acid was found in the three active filtrates while an unidentified organic acid was found in the other. The reduced absorption of 144Ce could be duplicated by citric acid at concentrations > 10-2M. Kojic, glucuronic, and 2-ketogluconic acids had no effect on absorption of 144Ce, but kojic and 2-ketogluconic acids reduced 90Sr absorption by soybean roots.

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