Cell Potentials, Cell Resistance, and Proton Fluxes in Corn Root Tissue: Effects of Dithioerythritol 1

AUTOR(ES)

Lin, Willy

RESUMO

Studies were made of the effect of dithioerythritol on net proton flux, potassium influx and efflux, cell potential, and cell resistance in fresh and washed corn (Zea mays L. WF9XM14) root tissue. Dithioerythritol induces equal proton influx and potassium efflux rates, decreases membrane resistance, and hyperpolarizes the cell potential. Greater effects on H+ and K+ fluxes are secured at pH 7 than at pH 5. Other sulfhydryl-protecting reagents produced the same responses. No evidence could be found that dithioerythritol affected energy metabolism or membrane ATPase, and proton influx was induced in the presence of uncoupling agents.

Documentos Relacionados

• MEMBRANE POTENTIALS, RESISTANCE, AND ION PERMEABILITY IN SQUID GIANT AXONS INJECTED OR PERFUSED WITH PROTEASES*
• Xylem and nonxylem cell formation in cytokinin-stimulated root tissue: Quantitative analysis of temperature effects
• Potassium Deficiency-induced Changes in Stomatal Behavior, Leaf Water Potentials, and Root System Permeability in Beta vulgaris L. 1
• Effects of Acetyl-Coenzyme A Carboxylase Inhibitors on Root Cell Transmembrane Electric Potentials in Graminicide-Tolerant and -Susceptible Corn (Zea mays L.).
• Induction and Development of Increased Ion Absorption in Corn Root Tissue 1