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Related Experiment Videos

Systemic signalling in barley through action potentials.

Hubert H Felle1, Matthias R Zimmermann

  • 1Botanisches Institut I, Justus-Liebig-Universität, Senckenbergstrasse 17, 35390, Giessen, Germany. Hubert.Felle@bio.uni-giessen.de

Planta
|January 18, 2007
PubMed
Summary
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Plant action potentials (APs) transmit signals across barley leaves, triggered by salt stress or amino acids. These electrical signals, involving ion fluxes and pH changes, may act as early warnings for pathogen attacks.

Area of Science:

  • Plant Physiology
  • Plant Electrophysiology
  • Stress Signaling

Background:

  • Plants utilize electrical signals for intercellular communication.
  • Action potentials (APs) are rapid, transient electrical events.
  • Understanding plant signaling mechanisms is crucial for crop resilience.

Purpose of the Study:

  • To investigate the characteristics and mechanisms of action potentials in barley leaves.
  • To explore the role of salt stress and amino acids in inducing plant APs.
  • To elucidate the ion flux and pH changes associated with plant APs.

Main Methods:

  • Apoplastic voltage- and ion-selective microprobes were used to measure electrical activity in barley leaves.
  • Mild salt stress (KCl, NH4Cl) and amino acids (glutamic acid, GABA) were applied to induce APs.

Related Experiment Videos

  • Changes in apoplastic and cytoplasmic pH were monitored during AP propagation.

    • Main Results:

    • Action potentials were measured in barley leaves, propagating bidirectionally at 20-30 cm/min.
    • Salt-induced APs involved depolarization, Ca(2+) influx, anion efflux, and K(+) efflux.
    • Amino acid-induced APs were mediated by receptor binding and Ca(2+)-activated anion efflux.
    • APs were accompanied by apoplastic alkalinization and cytoplasmic acidification.

    Conclusions:

    • Plant action potentials serve as rapid, systemic signals in response to stimuli like salt stress and amino acids.
    • The observed ion fluxes and pH changes suggest a role in stress perception and defense.
    • APs may function as an early warning system against pathogen invasion in plants.