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Determinations were made for corn (Zea mays L., WF9-Tms x M14) mitochondria of the stoichiometric relationship between K(+) transport and bond energy produced in respiration (K(+)/ approximately ratio). With inward pumping of potassium acetate activated by NADH oxidation, the initial rate of K(+) transported into the sucrose inaccessible space varied between 0.58 and 0.97 K(+)/ approximately , assuming 2 high energy bond equivalents per NADH oxidized. Only small amounts of H(+) were ejected. Valinomycin did not alter the ratio.Efflux pumping of K(+) in KCl media gave a K(+)/ approximately of 0.92. Substituting sucrose for KCl caused a drop in respiration and H(+) ejection, indicating a requirement for cation efflux pumping in acceptorless respiration. Valinomycin added to the KCl medium accelerated passive swelling but did not impair subsequent efflux pumping, although respiration was partially uncoupled.

The Stoichiometry of Respiration-driven Potassium Transport in Corn Mitochondria