An epidermis-driven mechanism positions and scales stem cell niches in plants
2016
Gruel, Jérémy | Landrein, Benoit | Tarr, Paul | Schuster, Christoph | Refahi, Yassin | Sampathkumar, Arun | Hamant, Olivier, O. | Meyerowitz, Elliot M. | Jönsson, Henrik | Sainsbury Laboratory Cambridge University (SLCU) ; University of Cambridge [UK] (CAM) | Reproduction et développement des plantes (RDP) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Centre National de la Recherche Scientifique (CNRS) | Division of Biology [Pasadena] ; California Institute of Technology (CALTECH) | Skane University Hospital [Lund]
International audience
Mostrar más [+] Menos [-]Inglés. How molecular patterning scales to organ size is highly debated in developmental biology. We explore this question for the characteristic gene expression domains of the plant stem cell niche residing in the shoot apical meristem. We show that a combination of signals originating from the epidermal cell layer can correctly pattern the key gene expression domains and notably leads to adaptive scaling of these domains to the size of the tissue. Using live imaging, we experimentally confirm this prediction. The identified mechanism is also sufficient to explain de novo stem cell niches in emerging flowers. Our findings suggest that the deformation of the tissue transposes meristem geometry into an instructive scaling and positional input for the apical plant stem cell niche.
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