Études des rôles des gènes CUC et MIR164 dans l’évolution des angiospermes
Auteur / Autrice : | Aurélie Vialette-Guiraud |
Direction : | Charlie Scutt |
Type : | Thèse de doctorat |
Discipline(s) : | Sciences de la vie |
Date : | Soutenance en 2010 |
Etablissement(s) : | Lyon, Ecole normale supérieure |
Ecole(s) doctorale(s) : | École doctorale de Biologie Moléculaire Intégrative et Cellulaire (Lyon) |
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Résumé
My doctoral studies focused on the evolution of the angiosperms or flowering plants. I studied the genes CUP-SHAPED COTYLEDON1-3 (CUC1-3) and the micro-RNA regulator of CUC1 and 2, miR164. In Arabidopsis thaliana, these genes regulate leaf shape and syncarpy. Phylogenetic analysis of the CUC and MIR164 families showed that the CUC/MIR164 module was probably already present in the last common ancestor of the extant angiosperms. We used functional analyses to show that these genes are important for compound leaf development in angiosperms. Moreover, we showed that the CUC/MIR164 module is important for carpel closure in A. Thaliana and that its exact role in syncarpy may differ between Petunia hybrida and A. Thaliana. These studies highlighted the recruitment of the CUC/MIR164 module to control the form of both leaves and the gynoecium in angiosperms.