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Related Experiment Videos

A transplasmamembrane electron transport system in maize roots.

R Federico1, C E Giartosio

  • 1Gruppo di Chimica Biologica e Strutturistica Chimica, Istituto di Chimica Biologica, Università degli Studi di Roma, 00185 Roma Italy.

Plant Physiology
|September 1, 1983
PubMed
Summary

Maize roots reduce ferricyanide via a transmembrane NADH dehydrogenase. This process is influenced by salt, temperature, and fusicoccin, impacting proton extrusion.

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Area of Science:

  • Plant Physiology
  • Biochemistry

Background:

  • Ferricyanide reduction in plant roots is a key physiological process.
  • Understanding the enzymatic mechanisms involved is crucial for plant science.

Purpose of the Study:

  • To investigate the mechanism of ferricyanide reduction in maize roots.
  • To determine the role of NADH dehydrogenase in this process.

Main Methods:

  • Studied ferricyanide reduction in intact maize roots under varying salt and temperature conditions.
  • Investigated the effect of fusicoccin and anaerobic conditions on proton extrusion.
  • Assayed NADH-ferricyanide oxidoreductase activity in isolated root microsomes.

Main Results:

  • Ferricyanide reduction in maize roots is dependent on salt concentration and temperature.

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  • Fusicoccin stimulates this reduction and influences proton extrusion.
  • A cyanide-insensitive NADH-ferricyanide oxidoreductase activity was identified in root microsomes.

    • Conclusions:

    • Evidence supports the hypothesis that a transmembrane NADH dehydrogenase mediates ferricyanide reduction in maize roots.
    • This enzyme activity is linked to proton extrusion mechanisms in plant cells.