title: EXORDIUM regulates brassinosteroid-responsive genes.
abstract: In a screen for potential mediators of brassinosteroid (BR) effects, the EXORDIUM (EXO) protein was identified as a regulator of BR-responsive genes. The EXO gene was characterized as a BR-up-regulated gene. EXO overexpression under the control of the 35SCaMV promoter resulted in increased transcript levels of the BR-up-regulated KCS1, Exp5, delta-TIP, and AGP4 genes, which likely are involved in the mediation of BR-promoted growth. 35S::EXO lines grown in soil or in synthetic medium showed increased vegetative growth in comparison to wild-type plants, resembling the growth phenotype of BR-treated plants. Thus, the EXO protein most likely promotes growth via the modulation of gene expression patterns.
authors.affiliation: Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Golm, Germany.
authors.forename: Danahe
authors.initials: D
authors.lastname: Coll-Garcia
authors.forename: Jeannine
authors.initials: J
authors.lastname: Mazuch
authors.forename: Thomas
authors.initials: T
authors.lastname: Altmann
authors.forename: Carsten
authors.initials: C
authors.lastname: Müssig
mesh_terms: D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology*; D018076:DNA, Complementary / Q000235:genetics; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D017343:Genes, Plant; D020411:Oligonucleotide Array Sequence Analysis; D010840:Phytosterols / Q000378:metabolism / Q000494:pharmacology*; D030821:Plants, Genetically Modified; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D019076:Transgenes
chemical_list: D029681:Arabidopsis Proteins; D018076:DNA, Complementary; D010840:Phytosterols; D012333:RNA, Messenger; C478491:exordium protein, Arabidopsis