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Related Experiment Videos

Trichome morphogenesis: a cell-cycle perspective.

A Schnittger1, M Hülskamp

  • 1ZMBP, Entwicklungsgenetik, Universität Tübingen, Auf der Morgenstelle 1, D-72076 Tüingen, Germany.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|June 25, 2002
PubMed
Summary

Arabidopsis trichome branching involves microtubule cytoskeleton and cell division regulation. The siamese mutant suggests trichomes evolved from multicellular forms, with cell division mechanisms potentially guiding branch formation.

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Area of Science:

  • Plant biology
  • Developmental biology
  • Genetics

Background:

  • Arabidopsis leaf hairs, known as trichomes, are single, polyploid epidermal cells.
  • Trichomes exhibit a complex, predictable branching pattern.
  • Over 15 genes regulating trichome branching have been identified.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying Arabidopsis trichome branching.
  • To explore the role of the cytoskeleton and cell division in branch formation.
  • To understand the evolutionary origins of trichome multicellularity.

Main Methods:

  • Gene cloning of key regulators (ZWICHEL, ANGUSTIFOLIA, STICHEL).
  • Analysis of the siamese mutant exhibiting multicellular trichomes.
  • Microtubule cytoskeleton observation.

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Main Results:

  • Identified genes highlight the involvement of the microtubule cytoskeleton in branching.
  • Evidence links cell division regulation to branch formation.
  • The siamese mutant suggests an evolutionary transition from multicellular to unicellular trichomes.

Conclusions:

  • Trichome branching is mechanistically linked to both microtubule dynamics and cell division control.
  • Cell division pathways may provide spatial cues for trichome branch development.
  • Arabidopsis trichomes likely evolved from multicellular precursors.