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Growth and tension in explosive fruit.

Gabriella Mosca1, Ryan C Eng2, Milad Adibi2

  • 1Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany; Technical University of Munich, 85748 Garching b. Munich, Germany.

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Explosive seed dispersal in Cardamine hirsuta is powered by tension from actively growing fruit cells. Microtubule reorientation and cell wall structure enable this remarkable plant mechanism.

Keywords:
cellulose microfibrilscortical microtubulesexplosive seed dispersalmulti-layer modelplant cell growth

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Area of Science:

  • Plant biology
  • Biomechanics
  • Cellular mechanics

Background:

  • Cardamine hirsuta (hairy bittercress) exhibits explosive seed dispersal.
  • Seed ejection is driven by tension in the fruit valves.
  • Unlike other plants, tension in C. hirsuta is not generated by drying but by active cell growth.

Purpose of the Study:

  • To investigate the mechanism by which growing exocarp cells generate tension for explosive seed dispersal in C. hirsuta.
  • To understand the role of microtubules and cell wall structure in this process.

Main Methods:

  • Investigated microtubule reorientation in exocarp cells.
  • Utilized mechanical modeling to simulate tension generation during growth.
  • Analyzed the role of cellulose microfibril orientation and cell wall layering.

Main Results:

  • Microtubule reorientation alters cellulose microfibril alignment in the cell wall.
  • Anisotropic cellulose microfibril orientation and cell shape changes lead to tension during growth.
  • A multi-layered cell wall with a cross-lamellate pattern of cellulose microfibrils enhances tension development.

Conclusions:

  • The interplay between cell wall properties and turgor-driven growth generates the tension for explosive seed dispersal.
  • This mechanism highlights a novel strategy for plant seed dispersal.