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Related Experiment Videos

The specification of leaf identity during shoot development

R A Kerstetter1, R S Poethig

  • 1Department of Biology, University of Pennsylvania, Philadelphia 19104-6018, USA. randallk@sas.upenn.edu

Annual Review of Cell and Developmental Biology
|January 19, 1999
PubMed
Summary

Plant development involves heteroblasty, where leaf types change over time. Genes controlling leaf identity and production are distinct, suggesting leaf development depends on timing within the plant's life cycle.

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Area of Science:

  • Plant biology
  • Developmental genetics
  • Plant physiology

Background:

  • Plants exhibit heteroblasty, producing diverse leaf types throughout their lifespan.
  • Heteroblasty is a fundamental aspect of shoot development, influenced by both internal developmental programs and environmental factors.
  • This developmental plasticity is crucial for adapting to changing conditions and progressing through life stages.

Purpose of the Study:

  • To investigate the genetic regulation of heteroblasty in plants.
  • To understand the relationship between leaf production and leaf identity during plant development.
  • To elucidate the role of temporal programs in determining leaf characteristics.

Main Methods:

  • Utilized mutational analysis in model organisms like maize and Arabidopsis.

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  • Examined genetic pathways controlling phase-specific leaf development.
  • Analyzed the interplay between leaf initiation timing and developmental phase.

    • Main Results:

    • Identified specific genes regulating distinct phases of leaf identity.
    • Demonstrated that leaf production and leaf identity are independently controlled genetic processes.
    • Found evidence that leaf identity is linked to the timing of its initiation within the shoot's developmental timeline.

    Conclusions:

    • Leaf development is a complex process involving distinct genetic controls for production and identity.
    • The temporal program of shoot development plays a critical role in defining leaf characteristics.
    • Understanding heteroblasty provides insights into plant adaptability and developmental plasticity.