Proton Efflux from Corn Roots Induced by Tripropyltin 1

AUTOR(ES)

Chastain, Chris J.

RESUMO

Tripropyltin restores medium acidification by washed corn root tissue in which electrogenic H+ efflux has been 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 chloride 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.

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