Unbound MEDLINE

Elastic domains regulate growth and organogenesis in the plant shoot apical meristem.

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.

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  • Authors

    Kierzkowski D, Nakayama N, Routier-Kierzkowska AL, Weber A, Bayer E, Schorderet M, Reinhardt D, Kuhlemeier C, Smith RS

    Source

    Science (New York, N.Y.) 335:6072 2012 Mar 2 pg 1096-9

    MeSH

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

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    22383847