Dev Cell 1–12 (2014). doi:10.1016/j.devcel.2014.05.020


Josep Vilarrasa-Blasi, Mary-Paz González-García, David Frigola, Norma Fàbregas, Konstantinos G. Alexiou, Nuria López-Bigas, Susana Rivas, Alain Jauneau, Jan U. Lohmann, Philip N. Benfey, Marta Ibañes and Ana I. Caño-Delgado.


The quiescent center (QC) maintains the activity of the surrounding stem cells within the root stem cell niche, yet specific molecular players sustaining the low rate of QC cell division remain poorly understood. Here, we identified a R2R3-MYB transcription factor, BRAVO (BRASSINOSTEROIDS AT VASCULAR AND ORGANIZING CENTER), acting as a cell-specific repressor of QC divisions in the primary root of Arabidopsis. Ectopic BRAVO expression restricts overall root growth and ceases root regeneration upon damage of the stem cells, demonstrating the role of BRAVO in counteracting Brassinosteroid (BR)-mediated cell division in the QC cells. Interest- ingly, BR-regulated transcription factor BES1 (BRI1- EMS SUPRESSOR 1) directly represses and physi- cally interacts with BRAVO in vivo, creating a switch that modulates QC divisions at the root stem cell niche. Together, our results define a mechanism for BR-mediated regulation of stem cell quiescence in plants.


Nuestros resultados muestran como los Brassinosteroides (BRs), hormonas esteroides de plantas, mantienen la homeostasis de las células madre. Mediante un abordaje micro genómico hemos identificado a BRAVO (Brassinosteroids at Vascular and Organizing Centre), un componente especifico de las células madre. BRAVO es un factor de transcripción R2R3 de la familia MYB, que actúa como interruptor molecular que controla las divisiones de las células madre.


Our laboratory investigates how Brassinosteroid (BR) hormones control plant growth and development. In particular, we are focused in understanding the spatial regulation of BR signalling in the vascular and stem cells. By using the root as a model organ we have uncovered a key role for BRs in stem cell function and cell cycle progression at the root meristem development necessary for normal root growth and development. These studies opened new avenues to study the role of plant stem cells on a mechanistic level.

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