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Physcomitrium patens: A Single Model to Study Oriented Cell Divisions in 1D to 3D Patterning.

Jeroen de Keijzer1, Alejandra Freire Rios1,2, Viola Willemsen2

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Summary

Plant cell division plane positioning guides development. Polarity proteins, cytoskeleton, and transcription factors control this process, enabling the transition from simple to complex 3D structures in organisms like Physcomitrium patens.

Keywords:
Physcomitriumasymmetric cell divisiondivision plane positioninggametophore initiationproliferative cell division

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Area of Science:

  • Plant developmental biology
  • Cell biology
  • Molecular genetics

Background:

  • Multicellular development relies on cell proliferation and specialization, critically dependent on spatial cell organization.
  • In plants, cell division plane positioning dictates daughter cell fates due to limited cell migration.
  • Understanding division plane control is crucial for deciphering plant morphogenesis.

Purpose of the Study:

  • To review recently uncovered mechanisms governing cell division plane control in plants.
  • To highlight the role of specific molecular players in plant body plan formation.
  • To showcase *Physcomitrium* (*Physcomitrella*) *patens* as a model for studying these processes.

Main Methods:

  • Review of recent literature on cell division plane control in *Physcomitrium* *patens*.
  • Focus on experimental tractability and accessibility of key developmental transitions.
  • Analysis of molecular mechanisms involving polarity proteins, cytoskeletal structures, and transcriptional regulators.

Main Results:

  • Identified polarity protein complexes and cytoskeletal structures as key regulators of division plane positioning.
  • Highlighted the role of transcriptional regulators in coordinating cell fate and division plane orientation.
  • Demonstrated the importance of these mechanisms in the transition from 1D to 3D body plan formation.

Conclusions:

  • Cell division plane control is a fundamental process in plant development, essential for establishing tissue architecture.
  • Specific molecular pathways involving polarity, cytoskeleton, and transcription factors are critical for 1D to 3D development.
  • *Physcomitrium* *patens* provides a powerful system for dissecting these complex developmental mechanisms.