Abstract
The distribution of tetraphenyl phosphonium between mycelium and external medium was used to estimate the membrane potential ( E m) in Neocosmospora. A minimum E m of −68 mV (interior negative) was calculated for aerobic mycelium in a buffer at pH 6.5 lacking metallic cations. The membrane was depolarized by carbonylcyanide- m-chlorophenylhydrazone, anaerobiosis, and KCl, whereas it was hyperpolarized by gramidicin, trifluoperazine (TFP), and prior treatment with acetate at low pH. TFP caused K + to be lost from the mycelium and stimulated zinc uptake. Acetate pretreatment also enhanced zinc uptake. These and previous results (K. Budd, 1988, Exp. Mycol. 12, 195–202) indicate that zinc transport in Neocosmospora is correlated with the membrane potential.
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