A novel Arabidopsis MYB-like transcription factor, MYBH, regulates hypocotyl elongation by

Yerim Kwon, Jun Hyeok Kim, Hoai Nguyen Nguyen, Yusuke Jikumaru, Yuji Kamiya, Suk Whan Hong, Hojoung Lee

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


Critical responses to developmental or environmental stimuli are mediated by different transcription factors, including members of the ERF, bZIP, MYB, MYC, and WRKY families. Of these, MYB genes play roles in many developmental processes. The overexpression of one MYB gene, MYBH, significantly increased hypocotyl elongation in Arabidopsis thaliana plants grown in the light, and the expression of this gene increased markedly in the dark. The MYBH protein contains a conserved motif, R/KLFGV, which was implicated in transcriptional repression. Interestingly, the gibberellin biosynthesis inhibitor paclobutrazol blocked the increase in hypocotyl elongation in seedlings that overexpressed MYBH. Moreover, the function of MYBH was dependent on phytochrome-interacting factor (PIF) proteins. Taken together, these results suggest that hypocotyl elongation is regulated by a delicate and efficient mechanism in which MYBH expression is triggered by challenging environmental conditions such as darkness, leading to an increase in PIF accumulation and subsequent enhanced auxin biosynthesis. These results indicate that MYBH is one of the molecular components that regulate hypocotyl elongation in response to darkness.

Original languageEnglish
Pages (from-to)3911-3922
Number of pages12
JournalJournal of experimental botany
Issue number12
Publication statusPublished - 2013 Sept

Bibliographical note

Funding Information:
This work was supported by a grant from the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (to Hojoung Lee, 2012; grant #2012-112068-3) and by a grant from the Korea Research Foundation (to Hojoung Lee, grant # 2009-0065693).


  • Arabidopsis
  • MYBH
  • PIF
  • auxin
  • hypocotyl elongation
  • photomorphogenesis

ASJC Scopus subject areas

  • Physiology
  • Plant Science


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