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Evolutionary patterns in auxin action.

Todd J Cooke1, DorothyBelle Poli, A Ester Sztein

  • 1Department of Cell Biology and Molecular Genetics, University of Maryland, College Park 20742, USA. tc23@umail.umd.edu

Plant Molecular Biology
|May 31, 2002
PubMed
Summary
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Plant hormone auxin (indole-3-acetic acid, IAA) regulation mechanisms found in seed plants are also present in early land plants like charophytes and bryophytes, suggesting modification rather than de novo evolution.

Area of Science:

  • Plant Biology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Auxin (indole-3-acetic acid, IAA) is a critical plant hormone.
  • Understanding its evolutionary origins is key to plant development.

Purpose of the Study:

  • To survey the literature on auxin action across the green plant lineage.
  • To investigate the evolutionary history of auxin regulation and response mechanisms.

Main Methods:

  • Comprehensive literature review.
  • Comparative analysis of auxin-related pathways and responses in charophytes, bryophytes, pteridophytes, and seed plants.

Main Results:

  • Early forms of IAA synthesis, regulation, and transport mechanisms are present in charophytes and bryophytes.

Related Experiment Videos

  • IAA regulates development in bryophytes and pteridophytes similarly to seed plants.
  • Seed plants utilize additional mechanisms like conjugation for finer IAA control.

    • Conclusions:

    • Auxin response mechanisms in seed plants evolved from pre-existing pathways in early land plants.
    • The molecular evolution of auxin action offers promising avenues for future research.