Proton Efflux from Corn Roots Induced by Tripropyltin

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Abstract
Tripropyltin [a protein synthesis inhibitor] restores medium acidification by washed corn root tissue in which electrogenic H+ efflux was blocked by ATPase inhibitors or injury. However, the restored H+ efflux is not electrogenic and will not drive K+ influx, and, by itself, tripropyltin is inhibitory to K+ influx. Tripropyltin elicits a 5-fold increase in endogenous Cl- efflux, and Cl-/OH- exchange can, thus, account for the observed acidification of the medium. This explanation cannot be applied equally to the acidification produced by the K+/H+ exchanging ionophore nigericin.