Abstract
The effect of fulvic acids (FA) on arbuscular mycorrhizal (AM) fungi and on the toxicity of lead and manganese toward these symbionts were demonstatedin vitro. Incubation of root segments colonized with the AM fungusGlomus intraradices in undiluted fraction of FA (813 mg/L carbon) decreased an outgrowth of intraradical hyphae. Diluted FA solutions (<271 mg/L C) did not influence the proportion of root segments bearing proliferating hyphae; solution containing 27.1 mg/L C even increased the proliferation. A decrease of heavy metal toxicity toward the fungus was observed when FA (81.3 mg/L C) were added to the solutions containing higher concentrations (≤100 μmol/L) of Mn and Pb; the positive effect of FA was not significant at higher concentrations of metals (0.5 mmol/L). A short-term cultivation of six different saprophytic microorganisms — three actinomycetes and three filamentous fungi — on the FA media (81.3 mg/L C) did not result in a modification of hyphal proliferation from the root segments subsequently incubated in these media.
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Malcová, R., Gryndler, M., Hršelová, H. et al. The effect of fulvic acids on the toxicity of lead and manganese to arbuscular mycorrhizal fungusGlomus intraradices . Folia Microbiol 47, 521–526 (2002). https://doi.org/10.1007/BF02818792
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DOI: https://doi.org/10.1007/BF02818792