Interactions of Vesicular‐arbuscular Mycorrhizal Infections and Heavy Metals in Plants

SUMMARY Leeks were grown on a γ‐irradiated soil selected for its low copper status, in a factorial experiment with additions of phosphorus and copper, and with or without inoculation with Glomus mosseae. There was no response in growth to added phosphorus, but responses to added copper and to inoculation. The results indicate that an infection with mycorrhizal fungi can increase the supply of copper to the host plant, in conditions where increased phosphorus nutrition does not increase dry weight. It is suggested that copper is absorbed and translocated by mycorrhizal hyphae in a manner analogous to that which occurs for phosphorus.