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Sylvia R Silveira1, Loann Collet1, Sahil M Haque1

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Localized expansion of internal cells drives anther lobe growth, influencing plant organogenesis. This study reveals how differential tissue growth shapes complex structures through mechanical forces.

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Area of Science:

  • Plant biology
  • Developmental biology
  • Biophysics

Background:

  • Differential growth between plant tissues creates mechanical conflicts that are crucial for organogenesis.
  • The anther, a complex male floral reproductive organ, serves as a model to study how mechanical forces and cell dynamics govern three-dimensional (3D) morphogenesis.

Purpose of the Study:

  • To investigate the interplay between cell dynamics and tissue-scale mechanics in controlling the 3D shape of the anther during organogenesis.
  • To propose a new concept, 'inflation potential,' to explain differential growth mechanisms.

Main Methods:

  • Deep live-cell imaging
  • Growth analysis
  • Osmotic treatments
  • Genetics
  • Mechanical modeling

Main Results:

  • Localized expansion of internal cells actively drives anther lobe outgrowth, with the epidermis stretching in response.
  • Mechanical load is transferred to the sub-epidermal endothecium layer in later stages, aiding in achieving the proper organ shape.
  • The concept of 'inflation potential' was proposed, integrating mechanical and anatomical factors driving differential growth.

Conclusions:

  • Inner tissues play an active mechanical role in controlling both the acquisition of organ shape and the cell dynamics of outer layers.
  • Understanding differential growth and mechanical conflicts is key to deciphering plant organogenesis and complex shape development.