Abstract
The role of ectomycorrhizae in the uptake of heavy metals by Quercus rubra was examined. Quercus rubra seedlings inoculated with the ectomycorrhizal fungus Suillus luleus were grown in a sandy loam soil containing a range of Cd, Ni or Pb concentrations. Ectomycorrhizal colonization rates were significantly reduced on Quercus seedlings by the heavy metals, particularly Cd and Ni. At high soil-heavy-metal concentrations leaf Cd, Ni and Pb content were lower in ectomycorrhizal seedlings compared to nonmycorrhizal controls. Root heavy-metal contents were also higher in ectomycorrhizal plants. Noninoculated seedlings exhibited macro- and microelement deficiencies. The size of non-mycorrhizal seedlings exposed to heavy metals was reduced compared to those inoculated with S. luteus. Ectomycorrhizal colonization and growth of Quercus seedlings are influenced by high soil concentrations of Cd, Ni or Pb.
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