Just say no: floral repressors help Arabidopsis bide the time

Curr Opin Plant Biol. 2009 Oct;12(5):580-6. doi: 10.1016/j.pbi.2009.07.006. Epub 2009 Aug 18.


Floral repressors ensure correct reproductive timing by safeguarding against premature flowering. In the past decade, several mechanisms of floral repression have come to light. Discrimination between direct and indirect repressors has been facilitated by increasing the use of chromatin immunoprecipitation assays. Certain MADS-domain transcription factors such as SHORT VEGETATIVE PHASE and FLOWERING LOCUS C bind directly to target euchromatin to repress specific loci including FLOWERING LOCUS T (FT) and FD. The AP2-domain transcription factor TEMPRANILLO 1 has also been shown to directly repress FT by binding its 5' UTR. We highlight emerging systems level approaches, including genome-scale direct binding studies (ChIP-chip and ChIP-Seq), which stand out in their promise to elucidate the complex network underlying the transition to flowering at an unprecedented level.

Publication types

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

MeSH terms

  • Arabidopsis / genetics*
  • Arabidopsis / physiology
  • Arabidopsis Proteins / genetics
  • Arabidopsis Proteins / metabolism*
  • Chromatin Immunoprecipitation
  • Flowers / genetics
  • Flowers / physiology*
  • Gene Expression Regulation, Plant
  • MADS Domain Proteins / genetics
  • MADS Domain Proteins / metabolism
  • Plant Leaves / genetics
  • Plant Leaves / physiology
  • Plant Shoots / genetics
  • Plant Shoots / physiology
  • Repressor Proteins / genetics
  • Repressor Proteins / metabolism*
  • Transcription Factors / genetics
  • Transcription Factors / metabolism


  • Arabidopsis Proteins
  • MADS Domain Proteins
  • Repressor Proteins
  • Transcription Factors