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Related Experiment Videos

Phytochrome-mediated cellular photomorphogenesis.

J A Schaer1, D F Mandoli, W R Briggs

  • 1Carnegie Institution of Washington, Stanford, California 94305-1297.

Plant Physiology
|July 1, 1983
PubMed
Summary
This summary is machine-generated.

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Red light influences oat seedling growth by affecting cell elongation and division. Different regions of the coleoptile and mesocotyl show varied responses to red light, primarily impacting cell elongation.

Area of Science:

  • Plant biology
  • Photomorphogenesis
  • Oat (Avena sativa) physiology

Background:

  • Red light plays a crucial role in plant development.
  • Understanding light-induced growth responses is key to plant science.
  • Oat seedlings exhibit distinct developmental stages sensitive to light.

Purpose of the Study:

  • To investigate the effects of red light on cell elongation and division in oat seedlings.
  • To map the responsiveness of different coleoptile and mesocotyl regions to varying red light fluences.
  • To elucidate the mechanisms underlying red light-induced growth stimulation and suppression.

Main Methods:

  • Assessment of red light-induced cell elongation and division in intact, etiolated oat seedlings.
  • Analysis of responses across different regions of the coleoptile and mesocotyl.

Related Experiment Videos

  • Comparison of effects in the very low and low fluence ranges of red light.

    • Main Results:

    • Coleoptile elongation is enhanced by red light, with specific regions showing higher sensitivity.
    • Cell division in the coleoptile is slightly inhibited at very low fluences and stimulated at low fluences.
    • Mesocotyl growth shows regional differences in response, with suppression of cell division and elongation in certain areas.
    • Red light's primary impact on oat growth differences involves the cell elongation process.

    Conclusions:

    • Red light differentially affects cell elongation and division in oat seedlings.
    • Specific regions of the coleoptile and mesocotyl exhibit unique sensitivities to red light fluence.
    • Cell elongation is the predominant process influenced by red light, determining growth stimulation or suppression.