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Modélisation du développement floral au stade où les sépales (premiers organes floraux à apparaître) commencent à se former : exemple de représentation de cellules exprimant trois gènes (rouge, vert et bleu) sur un bouton floral virtuel en 3D, reconstruit à partir d'images réelles obtenues au microscope confocal. La représentation 3D a plusieurs intérêts, elle permet de quantifier certains paramètres pour chaque cellule (taille, forme) et de projeter l'expression des gènes d'intérêts sur le…

Top of the female reproductive organ of the mouse-ear cress Arabidopsis thaliana, a species of plant, in which the ETTIN gene (which encodes a protein involved in the signalling pathway of a plant growth regulator) has been deactivated, observed using a scanning electron microscope. It is possible to see the stigmatic papillae, which receive the pollen, and, in the middle, two ovules. The deactivation of the gene has caused these ovules to develop outside the ovary. These experiments help us…

Female reproductive organ of the mouse-ear cress Arabidopsis thaliana, a species of plant, in which the ETTIN gene (which encodes a protein involved in the signalling pathway of a plant growth regulator) has been deactivated, observed using a scanning electron microscope. It is possible to see the stigmatic papillae, which receive the pollen, and seven ovules. The deactivation of the gene has caused these ovules to develop outside the ovary. These experiments help us understand how genes govern…

Bouton floral d'Arabette des dames, "Arabidopsis thaliana", observé à la loupe binoculaire. Le bouton est fermé et on ne voit que les organes externes, les sépales. Une échelle millimétrique collée sur la lame permet d'estimer rapidement la taille du bouton, soit son stade de développement approximatif, en vue d'études ultérieures.

Bouton floral d'Arabette des dames, "Arabidopsis thaliana", observé à la loupe binoculaire. Le bouton est fermé et on ne voit que les organes externes, les sépales. Une échelle millimétrique collée sur la lame permet d'estimer rapidement la taille du bouton, soit son stade de développement approximatif, en vue d'études ultérieures.

Virtual cross-section of a flower bud of thale cress (arabidopsis thaliana), in which the various cell types that will produce the flower organs have been artificially coloured. To obtain these images, scientists digitised a real-life cross-section. The colouring was achieved by applying a colour code based on the cell types. This representation gives an at-a-glance visual overview of the gene expression data, obtained using various methods (including in situ hybridisation and confocal imaging)…

Analysing the curvature of a sepal of thale cress (arabidopsis thaliana), using the 3D MorphoGraphX imaging software solution. The intensity of the surface curvature is represented using a colour scale, with blue-green indicating a more pronounced curvature than red. Note that the sepal is relatively uniformly curved, except at the two ends, where it curves more sharply. The purpose of this visual representation is to yield a method for quickly and simply quantifying the shape and curvature of…