The Stoichiometry of Respiration-driven Potassium Transport in Corn Mitochondria 1

AUTOR(ES)

Kirk, Betty I.

RESUMO

Determinations were made for corn (Zea mays L., WF9-Tms × M14) mitochondria of the stoichiometric relationship between K+ transport and bond energy produced in respiration (K+/∼ 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+/∼, assuming 2 high energy bond equivalents per NADH oxidized. Only small amounts of H+ were ejected. Valinomycin did not alter the ratio.

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