title: Flowering and trichome development share hormonal and transcription factor regulation.
abstract: Gibberellins (GAs) and cytokinins (CKs) are plant hormones that act either synergistically or antagonistically during the regulation of different developmental processes. In Arabidopsis thaliana, GAs and CKs overlap in the positive regulation of processes such as the transition from the vegetative to the reproductive phase and the development of epidermal adaxial trichomes. Despite the fact that both developmental processes originate in the rosette leaves, they occur separately in time and space. Here we review how, as genetic and molecular mechanisms are being unraveled, both processes might be closely related. Additionally, this shared genetic network is not only dependent on GA and CK hormone signaling but is also strictly controlled by specific clades of transcription factor families. Some key flowering genes also control other rosette leaf developmental processes such as adaxial trichome formation. Conversely, most of the trichome activator genes, which belong to the MYB, bHLH and C2H2 families, were found to positively control the floral transition. Furthermore, three MADS floral organ identity genes, which are able to convert leaves into floral structures, are also able to induce trichome proliferation in the flower. These data lead us to propose that the spatio-temporal regulation and integration of diverse signals control different developmental processes, such as floral induction and trichome formation, which are intimately connected through similar genetic pathways.
authors.affiliation: Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Campus UAB, Bellaterra (Cerdanyola del Vallès) 08193 Barcelona, Spain Sequentia Biotech, Parc Científic de Barcelona (PCB), 08028 Barcelona, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Matías-Hernández
authors.affiliation: Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Campus UAB, Bellaterra (Cerdanyola del Vallès) 08193 Barcelona, Spain.
authors.forename: Andrea E
authors.initials: AE
authors.lastname: Aguilar-Jaramillo
authors.affiliation: Sequentia Biotech, Parc Científic de Barcelona (PCB), 08028 Barcelona, Spain.
authors.forename: Riccardo Aiese
authors.initials: RA
authors.lastname: Cigliano
authors.affiliation: Sequentia Biotech, Parc Científic de Barcelona (PCB), 08028 Barcelona, Spain.
authors.forename: Walter
authors.initials: W
authors.lastname: Sanseverino
authors.affiliation: Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Campus UAB, Bellaterra (Cerdanyola del Vallès) 08193 Barcelona, Spain ICREA (Institució Catalana de Recerca i EstudisAvançats), Barcelona, Spain soraya.pelaz@cragenomica.es.
authors.forename: Soraya
authors.identifier: http://orcid.org/0000-0001-7699-9330
authors.initials: S
authors.lastname: Pelaz
mesh_terms: D035264:Flowers / Q000187:drug effects / Q000235:genetics / Q000254:growth & development*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D056626:Inflorescence / Q000187:drug effects / Q000235:genetics / Q000254:growth & development; D010937:Plant Growth Regulators / Q000494:pharmacology*; D014157:Transcription Factors / Q000378:metabolism*; D064201:Trichomes / Q000187:drug effects / Q000235:genetics / Q000254:growth & development*
chemical_list: D010937:Plant Growth Regulators; D014157:Transcription Factors
keywords: Cytokinis; Floral induction; Flower organs; Gibberellins; Hormone siganling; Trichome formation.