The Myb-domain protein ULTRAPETALA1 INTERACTING FACTOR 1 controls floral meristem activities in Arabidopsis.
2016
Moreau, Fanny | Thévenon, Emmanuel | Blanvillain, Robert | Lopez-Vidriero, Irene | Franco-Zorrilla, Jose Manuel | Dumas, Renaud | Parcy, François | Morel, Patrice | Trehin, Christophe | Carles, Cristel C | Physiologie cellulaire et végétale (LPCV) ; Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG) ; Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) | Centro Nacional de Biotecnología [Madrid] (CNB-CSIC) ; Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | 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) | Rhone-Alpes county (Allocation Doctorale de Recherche, Cluster 7) [12-01293101]; Centre National de la Recherche Scientifique (CNRS-Higher Education Chair) [0428-64]; University of Grenoble-Alpes (Chaire Initiative Universitaire Alpes, UGA-UJF); French National Agency Young Researcher Grant [ChromFlow ANR JCJC] [SVSE2-1206 01] | ANR-10-JCJC-1206,ChromFlow,Dynamique de l'activation de la chromatine au cours de la morphogenèse florale(2010)
International audience
Afficher plus [+] Moins [-]anglais. Higher plants continuously and iteratively produce new above-ground organs in the form of leaves, stems and flowers. These organs arise from shoot apical meristems whose homeostasis depends on coordination between self-renewal of stem cells and their differentiation into organ founder cells. This coordination is stringently controlled by the central transcription factor WUSCHEL (WUS), which is both necessary and sufficient for stem cell specification inArabidopsis thaliana ULTRAPETALA1 (ULT1) was previously identified as a plant-specific, negative regulator ofWUSexpression. However, molecular mechanisms underlying this regulation remain unknown. ULT1 protein contains a SAND putative DNA-binding domain and a B-box, previously proposed as a protein interaction domain in eukaryotes. Here, we characterise a novel partner of ULT1, named ULT1 INTERACTING FACTOR 1 (UIF1), which contains a Myb domain and an EAR motif. UIF1 and ULT1 function in the same pathway for regulation of organ number in the flower. Moreover, UIF1 displays DNA-binding activity and specifically binds toWUSregulatory elements. We thus provide genetic and molecular evidence that UIF1 and ULT1 work together in floral meristem homeostasis, probably by direct repression ofWUSexpression.
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