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Phytochrome coordinates Arabidopsis shoot and root development.

Frances J Salisbury1, Anthony Hall, Claire S Grierson

  • 1Institute of Molecular Plant Sciences, Edinburgh University, Kings Buildings, Mayfield Road, Edinburgh, EH9 3JR, UK.

The Plant Journal : for Cell and Molecular Biology
|April 11, 2007
PubMed
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Phytochrome, a light receptor, controls plant growth by altering auxin distribution. This discovery reveals how phytochrome coordinates shoot and root development, explaining its significant impact on plants.

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Phytochromes are key photoreceptors regulating plant development.
  • Phytochrome-mediated responses, like hypocotyl elongation, are linked to the plant hormone auxin.
  • Molecular mechanisms of phytochrome-auxin cross-talk remain largely unknown.

Purpose of the Study:

  • To investigate the molecular mechanisms of phytochrome and auxin cross-talk.
  • To determine how phytochrome influences auxin distribution and plant development.
  • To elucidate phytochrome's role in coordinating shoot and root development.

Main Methods:

  • Analysis of phytochrome's effect on lateral root emergence.
  • Investigation of auxin distribution changes in response to phytochrome signaling.

Related Experiment Videos

  • Long-distance signaling assays to track phytochrome's influence on root development.

    • Main Results:

    • Phytochrome regulates lateral root emergence by manipulating auxin distribution.
    • Shoot-localized phytochrome influences root development through auxin redistribution.
    • Evidence of long-distance signaling from shoots to roots mediated by phytochrome and auxin.

    Conclusions:

    • Phytochrome acts as a crucial coordinator of shoot and root development.
    • Phytochrome's regulation of auxin distribution is a key mechanism for its developmental effects.
    • This study provides new insights into the extensive cross-talk between phytochrome and auxin signaling pathways.