Abstract
Zinc-sufficient mycelium of Neocosmospora vasinfecta ATCC 11686 incubated in a buffer lacking metallic cations displayed complex velocity/concentration kinetics for the transport of zinc across the mycelial surface. Two transport “systems” were identified from Hofstee plots, one with a high affinity for zinc ( K 0.5 approx 1.1 μ M) and one with a low affinity for zinc ( K 0.5 approx 770 μ M). Zinc transport via the high-affinity system was relatively insensitive to the presence of other metallic cations in the uptake medium but was strongly inhibited by anaerobiosis and by carbonylcyanide- m-chlorophenylhydrazone at uncoupling concentrations. Diethylstilbestrol and dicyclohexylcarbodiimide only weakly inhibited zinc transport. The transport of zinc was also influenced by mycelial zinc and magnesium status, and to a lesser extent by mycelial P content.
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