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Related Experiment Videos

H and k electrogenic exchanges in corn roots.

J B Thibaud1, A Soler, C Grignon

  • 1Biochimie et Physiologie Végétales, Institut National de la Recherche Agronomique (Centre National de la Recherche Scientifique, UA 573), Ecole Nationale Supérieure Agronomique, 34060 Montpellier Cedex, France.

Plant Physiology
|July 1, 1986
PubMed
Summary

Corn roots utilize a potassium/hydrogen (K+/H+) exchange system for nutrient transport. Vanadate uncouples this system, allowing for isotopic exchange of potassium, impacting membrane potential and active transport.

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Area of Science:

  • Plant Physiology
  • Ion Transport Mechanisms
  • Biochemistry

Background:

  • Understanding ion transport in plants is crucial for nutrient uptake and cellular function.
  • The plasma membrane potential and ion fluxes are key indicators of plant cell activity.
  • Distinguishing active from passive transport is essential for comprehending plant physiological responses.

Purpose of the Study:

  • To investigate the K+/H+ exchange system in excised corn roots.
  • To differentiate active and passive components of membrane potential and ion transport.
  • To elucidate the role of vanadate in modulating K+ transport.

Main Methods:

  • Measurements of membrane potential, H+ exchange, and K+ flux in excised corn roots.
  • Experiments conducted at various pH and K+ concentrations, with and without vanadate.

Related Experiment Videos

  • Comparison of results under normal, hypoxic, and inhibitor-treated conditions.

    • Main Results:

    • Corn roots exhibit a K+/H+ exchange system.
    • Electrogenic potential magnitude is independent of active H+ extrusion rate.
    • Vanadate treatment uncouples the K+ component of the H+/K+ antiport, facilitating isotopic exchange.

    Conclusions:

    • The electrogenic potential is influenced by the stoichiometry of active H+/K+ exchange.
    • Active K+ transport is dependent on metabolic energy and Mg-ATPase activity.
    • Vanadate's effect suggests a mechanism for mediating isotopic K+ exchange via the H+/K+ antiport.