EXORDIUM regulates brassinosteroid-responsive genes

FEBS Lett. 2004 Apr 9;563(1-3):82-6. doi: 10.1016/S0014-5793(04)00255-8.


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.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Arabidopsis / drug effects*
  • Arabidopsis / genetics
  • Arabidopsis / growth & development
  • Arabidopsis Proteins / genetics
  • Arabidopsis Proteins / metabolism
  • Arabidopsis Proteins / pharmacology*
  • DNA, Complementary / genetics
  • Gene Expression Regulation, Plant / drug effects*
  • Genes, Plant*
  • Oligonucleotide Array Sequence Analysis
  • Phytosterols / metabolism
  • Phytosterols / pharmacology*
  • Plants, Genetically Modified
  • Polymerase Chain Reaction
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Transgenes


  • Arabidopsis Proteins
  • DNA, Complementary
  • Phytosterols
  • RNA, Messenger
  • exordium protein, Arabidopsis