Les séminaires ont lieu sur le Campus Montpellier SupAgro/INRA de La Gaillarde (2, place P. Viala Montpellier)

Mercredi 15 décembre 2021 à 11h – Amphi 206

Stéphanie Robert

( Umeå Plant Science Center – Department of Forest Genetics and Plant Physiology at the Swedish University of Agricultural Sciences (SLU) Suède )

Adding a piece to the leaf epidermis puzzle: Towards a better understanding of cell shape acquisition

In plants, the epidermis plays an essential role in shaping the entire organism, as it is thought to be limiting for growth and contains stiff and cohesive cell walls, which hinder cell-cell movements. Puzzle-shaped leaf pavement cells displaying inter digitated lobes and indents in the two-dimensional plane of the leaf epidermis provide a powerful model system to investigate the cellular and subcellular processes underlying cell polarity and shape determination in plant tissues. The formation of these multipolar cells is regulated by auxin at the plasma membrane via the subcellular compartmentation of Rho GTPase of plants (ROP) signaling pathways but it remains unclear how such local molecular heterogeneities are translated into local cell wall properties to generate local shape changes. I will present our data on cell shape acquisition using jigsaw puzzle-shaped leaf epidermal pavement cells of Arabidopsis as a remarkably synchronous model of cell shape development.

Contacts IBIP :

Sabine Zimmermann (sabine.zimmermann@cnrs.fr)
Alexandre Martiniere (alexandre.martiniere@cnrs.fr)
Florent Pantin (florent.pantin@supagro.fr)
Chantal Baracco (chantal.baracco@inrae.fr)