Elastic Domains Regulate Growth and Organogenesis in the Plant Shoot Apical Meristem

Daniel Kierzkowski, Naomi Nakayama, Anne-Lise Routier-Kierzkowska, Alain Weber, Emmanuelle Bayer, Martine Schorderet, Didier Reinhardt, Cris Kuhlemeier, Richard S Smith

Research output: Contribution to journalArticlepeer-review

Abstract

Although genetic control of morphogenesis is well established, elaboration of complex shapes requires changes in the mechanical properties of cells. In plants, the first visible sign of leaf formation is a bulge on the flank of the shoot apical meristem. Bulging results from local relaxation of cell walls, which causes them to yield to internal hydrostatic pressure. By manipulation of tissue tension in combination with quantitative live imaging and finite-element modeling, we found that the slow-growing area at the shoot tip is substantially strain-stiffened compared with surrounding fast-growing tissue. We propose that strain stiffening limits growth, restricts organ bulging, and contributes to the meristem's functional zonation. Thus, mechanical signals are not just passive readouts of gene action but feed back on morphogenesis.
Original languageEnglish
Pages (from-to)1096-1099
Number of pages4
JournalScience
Volume335
Issue number6072
DOIs
Publication statusPublished - 2 Mar 2012

Keywords

  • Cell Wall
  • Elasticity
  • Hydrostatic Pressure
  • Lycopersicon esculentum
  • Meristem
  • Models, Biological
  • Morphogenesis
  • Osmolar Concentration
  • Osmotic Pressure
  • Plant Shoots

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