Journal
SCIENCE
Volume 335, Issue 6072, Pages 1096-1099Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1213100
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Funding
- Swiss National Science Foundation
- SystemsX.ch
- European Union
- European Molecular Biology Organization
- Roche Research Foundation
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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.
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