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На главную > Seminars > Previous seminars > Séminaires 2018 > Séminaire MSC, 26 novembre 2018 11H30 en 454A. Ibrahim Cheddadi : Modélisation de la croissance végétale : flux d’eau et mécanique des parois cellulaires".

Séminaire MSC, 26 novembre 2018 11H30 en 454A. Ibrahim Cheddadi : Modélisation de la croissance végétale : flux d’eau et mécanique des parois cellulaires"

Unless otherwise stated, seminars and defences take place at 11:30 in room 454A of Condorcet building.


The growth of plant organs is a complex process powered by osmosis that attracts water inside the cells. This influx of water induces an elastic extension of the cell walls that, by resisting, build up pressure in cells, called turgor pressure. Above a certain stress threshold, cell walls yield to the turgor pressure and the cells grow. Based on Lockhart’s seminal work, various models have been proposed of this synergistic coupling to describe the growth of plant tissues. However, these models have been developed in the context of single cell growth, more easily accessible to experimentation, or have focused on the description of wall mechanical properties, neglecting the role of water fluxes and osmosis. In this work, we propose a new multicellular model to study the interaction between osmosis and cell walls mechanics and how this impacts tissue development. We show that taking into account this coupling leads to new emergent properties at the level of the multicellular system, that can help interpret different aspects of morphogenesis in plant organs. In particular, the system can display a new type of lateral inhibitory mechanism that could contribute to the amplification of growth heterogeneities, essential for shape differentiation during morphogenesis.


Contact : Équipe séminaires / Seminar team - Published on / Publié le 22 November 2018


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