SMCs arise multiple times, in each flower during the formation of the reproductive organs.
In flowering plants, the first cells representing the germline, the spore mother cells (SMCs), differentiate only late in development. The number of germ cells depends on the balance between proliferation (self-renewal) and differentiation, a process controlled by both intrinsic factors and signals from the surrounding somatic tissues. In animals, primordial germ cells (PGCs) are set-aside during embryogenesis from a mass of pluripotent cells. IntroductionĪ hallmark of sexual reproduction in multicellular organisms is the separation of the germline from the soma. Altogether, our study suggests that tissue geometry channels reproductive cell fate in the Arabidopsis ovule primordium. Altered primordium geometry coincided with a delay in the fate restriction process in katanin mutants. 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. Tissue growth models uncovered plausible morphogenetic principles involving a spatially confined growth signal, differential mechanical properties, and cell growth anisotropy. We identified the spatio-temporal pattern of cell division that acts in a domain-specific manner as the primordium forms. We generated 92 annotated 3D images at cellular resolution in Arabidopsis. Here, we explored how organ growth contributes to SMC differentiation. In flowering plants, the female germline precursor differentiates as a single spore mother cell (SMC) as the ovule primordium forms. In multicellular organisms, sexual reproduction requires the separation of the germline from the soma.
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