Transcriptional repression of BODENLOS by HD-ZIP transcription factor HB5 in Arabidopsis thaliana.

I. De Smet, S. Lau, J.S. Ehrismann, I. Axiotis, M. Kolb, M. Kientz, D. Weijers, G. Jürgens

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)

Abstract

In Arabidopsis thaliana, the phytohormone auxin is an important patterning agent during embryogenesis and post-embryonic development, exerting effects through transcriptional regulation. The main determinants of the transcriptional auxin response machinery are AUXIN RESPONSE FACTOR (ARF) transcription factors and AUXIN/INDOLE-3-ACETIC ACID (AUX/IAA) inhibitors. Although members of these two protein families are major developmental regulators, the transcriptional regulation of the genes encoding them has not been well explored. For example, apart from auxin-linked regulatory inputs, factors regulating the expression of the AUX/IAA BODENLOS (BDL)/IAA12 are not known. Here, it was shown that the HOMEODOMAIN-LEUCINE ZIPPER (HD-ZIP) transcription factor HOMEOBOX PROTEIN 5 (HB5) negatively regulates BDL expression, which may contribute to the spatial control of BDL expression. As such, HB5 and probably other class I HD-ZIP proteins, appear to modulate BDL-dependent auxin response.
Original languageEnglish
Pages (from-to)3009-3019
JournalJournal of Experimental Botany
Volume64
Issue number10
DOIs
Publication statusPublished - 2013

Keywords

  • regulated gene-expression
  • of-function mutation
  • plant development
  • auxin response
  • homeobox gene
  • class-i
  • shade avoidance
  • root initiation
  • homeodomain
  • protein

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