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A new perspective on auxin perception.

Maria Shishova1, Sylvia Lindberg

  • 1Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia. mshishova@mail.ru

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Summary
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Plant hormone auxin perception may involve calcium channels in the plasma membrane. This study proposes a new model where auxin directly stimulates calcium transport, impacting plant cell signaling.

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Area of Science:

  • Plant biology
  • Molecular signaling
  • Cellular physiology

Background:

  • The mechanisms of auxin perception are crucial in plant biology.
  • While the soluble F-box protein TIR1 is a known auxin receptor, evidence suggests another plasma membrane-linked perception pathway exists.
  • Existing models propose protein kinase or G-protein involvement in this alternative pathway.

Purpose of the Study:

  • To propose a novel model for auxin perception at the plasma membrane.
  • To investigate the role of Ca(2+) channels in rapid auxin-induced cellular responses.
  • To provide a hypothetical scheme for auxin signal transduction at the plasma membrane.

Main Methods:

  • Analysis of rapid auxin-induced cellular reactions, including membrane potential and ion concentration changes.
  • Detailed inhibitor analysis using both living plant cells and isolated plasma membranes.
  • Comparative analysis of auxin and serotonin perception mechanisms.

Main Results:

  • Auxin rapidly induces changes in membrane potential and cytosol Ca(2+) and H(+) concentrations.
  • External Ca(2+) concentration modulates plant cell sensitivity to hormones.
  • Inhibitor analysis suggests auxin may directly stimulate Ca(2+) transport across the plasma membrane.

Conclusions:

  • A new model for auxin perception involving direct stimulation of plasma membrane Ca(2+) channels is proposed.
  • This pathway contributes to rapid auxin signaling and cellular responses.
  • Understanding this mechanism offers new insights into plant hormone signal transduction.