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Phytochrome-mediated Electric Potential Changes in Oat Seedlings.

I A Newman1, W R Briggs

  • 1Biological Laboratories, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138.

Plant Physiology
|December 1, 1972
PubMed
Summary
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Brief red light exposure causes reversible electrical changes in Avena coleoptiles. These light-induced electrical responses are crucial for plant photomorphogenesis and development.

Area of Science:

  • Plant physiology
  • Photobiology
  • Biophysics

Background:

  • Plant responses to light are critical for growth and development.
  • Specific light wavelengths, like red and far-red light, play key roles in mediating these responses.
  • Understanding the biophysical mechanisms underlying light perception is essential.

Purpose of the Study:

  • To investigate the rapid electrical changes in etiolated Avena coleoptiles induced by red light.
  • To determine the reversibility of these electrical responses by far-red light.
  • To characterize the kinetics and conditions for these light-induced electrical phenomena.

Main Methods:

  • Exposing etiolated Avena coleoptiles to brief periods of red light.
  • Measuring electrical potential changes using a flowing 10 mm KCl solution.

Related Experiment Videos

  • Investigating the effect of subsequent far-red light exposure on the electrical responses.

    • Main Results:

    • Red light induced rapid (within 15 seconds) and reversible electrical changes (5-10 mV) in the coleoptile's upper centimeter.
    • These electrical changes persisted for at least 12 minutes.
    • Far-red light reversed the red light-induced electrical changes, and sequential red light treatments required an intervening far-red exposure to elicit a response.

    Conclusions:

    • Red and far-red light trigger rapid, reversible electrical potential changes in Avena coleoptiles.
    • These findings highlight the role of electrical signaling in plant photomorphogenesis.
    • The study provides insights into the biophysical basis of light perception in plants.