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Robust branch patterning in moss shoots via symplasmic auxin diffusion.

Jeanne Abitbol-Spangaro1, Gladys Cloarec1, Arthur Muller1

  • 1Laboratoire Reproduction et Développement des Plantes, ENS de Lyon, CNRS, Université Claude Bernard Lyon 1, INRAE, INRIA, 69007 Lyon, France.

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This study reveals that auxin diffusion through plasmodesmata can explain branching patterns in moss shoots. This mechanism offers a unique developmental signature distinct from vascular plants.

Keywords:
Physcomitriumauxinbranchingdiffusionmossplasmodesmata

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Area of Science:

  • Plant developmental biology
  • Computational modeling
  • Morphological diversity

Background:

  • Branching patterns are crucial for plant morphological diversity.
  • Auxin regulates branching in both vascular plants and bryophytes.
  • The role of auxin diffusion in bryophyte branching is not well understood.

Purpose of the Study:

  • To investigate if symplasmic auxin diffusion can explain branching patterns in the moss Physcomitrium patens.
  • To develop a computational model for symplasmic auxin diffusion in moss shoots.
  • To understand the biophysical basis of branching control in bryophytes.

Main Methods:

  • Developed a 3D computational model of symplasmic auxin diffusion.
  • Integrated molecular, cell, and tissue scales in the model.
  • Guided model design with experimental data and geometric measurements.

Main Results:

  • Symplasmic auxin diffusion alone can account for observed moss branching patterns.
  • The model explains changes in branching due to genetic modifications of symplasmic permeability.
  • Demonstrated increased branch spacing robustness during moss shoot development.

Conclusions:

  • Auxin diffusion via plasmodesmata is a sufficient mechanism for branching control in mosses.
  • This diffusion-based mechanism results in a unique developmental signature in bryophytes.
  • Findings provide mechanistic insights into plant architectural evolution.