VEGETATIVE1 is essential for development of the compound inflorescence in pea

Ana Berbel, Cristina Ferrándiz, Valérie Hecht, Marion Dalmais, Ole S. Lund, Frances C. Sussmilch, Scott A. Taylor, Abdelhafid Bendahmane, T.H. Noel Ellis, José P. Beltrán, James L. Weller and Francisco Madueño ()
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Ana Berbel: Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas–Universidad Politécnica de Valencia
Cristina Ferrándiz: Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas–Universidad Politécnica de Valencia
Valérie Hecht: School of Plant Science, University of Tasmania, Hobart
Marion Dalmais: Unité de Recherche en Génomique Végétale, UMR INRA-CNRS
Ole S. Lund: Danish Institute of Agricultural Sciences
Frances C. Sussmilch: School of Plant Science, University of Tasmania, Hobart
Scott A. Taylor: School of Plant Science, University of Tasmania, Hobart
Abdelhafid Bendahmane: Unité de Recherche en Génomique Végétale, UMR INRA-CNRS
T.H. Noel Ellis: John Innes Centre
José P. Beltrán: Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas–Universidad Politécnica de Valencia
James L. Weller: School of Plant Science, University of Tasmania, Hobart
Francisco Madueño: Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas–Universidad Politécnica de Valencia

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: Abstract Unravelling the basis of variation in inflorescence architecture is important to understanding how the huge diversity in plant form has been generated. Inflorescences are divided between simple, as in Arabidopsis, with flowers directly formed at the main primary inflorescence axis, and compound, as in legumes, where they are formed at secondary or even higher order axes. The formation of secondary inflorescences predicts a novel genetic function in the development of the compound inflorescences. Here we show that in pea this function is controlled by VEGETATIVE1 (VEG1), whose mutation replaces secondary inflorescences by vegetative branches. We identify VEG1 as an AGL79-like MADS-box gene that specifies secondary inflorescence meristem identity. VEG1 misexpression in meristem identity mutants causes ectopic secondary inflorescence formation, suggesting a model for compound inflorescence development based on antagonistic interactions between VEG1 and genes conferring primary inflorescence and floral identity. Our study defines a novel mechanism to generate inflorescence complexity.

Date: 2012
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DOI: 10.1038/ncomms1801

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