Developmental Biology Plant Biology
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Organ geometry channels reproductive cell fate in the Arabidopsis ovule primordium
Elvira Hernandez-Lagana, Gabriella Mosca, Ethel Mendocilla-Sato, Nuno Pires, Anja Frey, Alejandro Giraldo-Fonseca, Caroline Michaud, Ueli Grossniklaus, Olivier Hamant Christophe Godin, Arezki Boudaoud, Daniel Grimanelli, Daphné Autran Is a corresponding author , Célia Baroux Is a corresponding author expand author listsee all
DIADE, University of Montpellier, CIRAD, IRD, France; Department of Plant and Microbial Biology and Zurich-Basel Plant Science Center, University of Zürich, Switzerland; Laboratoire Reproduction et Développement des Plantes, University of Lyon, ENS Lyon, UCB Lyon 1, CNRS, INRAE, INRIA, France
Research Article May 7, 2021
In multicellular organisms, sexual reproduction requires the separation of the germline from the soma. In flowering plants, the female germline precursor differentiates as a single spore mother cell (SMC) as the ovule primordium forms. Here, we explored how organ growth contributes to SMC differentiation. We generated 92 annotated 3D images at cellular resolution in Arabidopsis. We identified the spatio-temporal pattern of cell division that acts in a domain-specific manner as the primordium forms. Tissue growth models uncovered plausible morphogenetic principles involving a spatially confined growth signal, differential mechanical properties, and cell growth anisotropy. Our analysis revealed that SMC characteristics first arise in more than one cell but SMC fate becomes progressively restricted to a single cell during organ growth. Altered primordium geometry coincided with a delay in the fate restriction process in katanin mutants. Altogether, our study suggests that tissue geometry channels reproductive cell fate in the Arabidopsis ovule primordium.
https://elifesciences.org/articles/66031
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