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Paths through the phytochrome network.

Eve-Marie Josse1, Julia Foreman, Karen J Halliday

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

Plant, Cell & Environment
|February 13, 2008
PubMed
Summary
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Phytochromes and basic helix-loop-helix (bHLH) transcription factors (TFs) regulate plant growth. This review explores how these signals integrate across tissues for coordinated development.

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Phytochrome B and PIF3 interaction discovery spurred research into phytochrome-bHLH TF signaling.
  • Extensive studies have elucidated how phytochromes and bHLH TFs control gene expression and plant growth.
  • Research has primarily focused on cell-autonomous signaling events.

Purpose of the Study:

  • To review current knowledge on phytochrome signaling via PIFs/PILs.
  • To evaluate evidence for cross-tissue signal integration in plants.
  • To highlight the importance of temporal and spatial signal integration for plant development.

Main Methods:

  • Literature review of existing research on phytochrome-PIF/PIL signaling pathways.
  • Analysis of studies investigating cell-autonomous and cross-tissue signaling mechanisms.

Related Experiment Videos

  • Synthesis of findings related to gene expression and plant growth regulation.

    • Main Results:

    • Phytochromes and bHLH TFs play critical roles in regulating plant growth and development.
    • Specific roles for PIF3-like bHLH TFs in light signaling pathways have been identified.
    • Evidence suggests that PIFs/PILs are involved in integrating signals across tissues.

    Conclusions:

    • Phytochrome-PIF/PIL signaling is central to plant photomorphogenesis.
    • Cross-tissue signal integration mediated by PIFs/PILs is essential for coordinating plant growth.
    • Further research is needed to fully understand the mechanisms of long-range signaling in plants.