AtMYB21, a gene encoding a flower-specific transcription factor, is regulated by COP1

Byongchul Shin, Goh Choi, Hankuil Yi, Seungchan Yang, Insook Cho, Jonghyun Kim, Seunghee Lee, Nam Chon Paek, Jae Hong Kim, Pill Soon Song, Giltsu Choi

Research output: Contribution to journalArticlepeer-review

112 Citations (Scopus)


Light is an important environmental signal that governs plant growth and development. One important light-signalling component involved in plant light responses is COP1. The pleiotropic phenotypes of the cap1 mutant suggest that COP1 regulates not only photomorphogenesis, but also other developmental processes. We investigated the role of COP1 by identifying genes that are regulated by COP1. We report that AtMYB21, a gene encoding a flower-specific transcription factor, is ectopically expressed in the cap1 mutant. Analysis shows that dark-grown transgenic seedlings expressing AtMYB21-GR fusion protein display some features of the cap1 mutant, including decreased hypocotyl cell expansion, open cotyledons in the dark, and seedling lethality in the presence of dexamethasone. Light-grown adult transgenic plants expressing AtMYB21 have shorter stems, smaller and narrower leaves, narrower petals, and malformed carpels. In addition, we show that AtMYB21 directly regulates two genes that are also expressed more abundantly in the cop1 mutant. The results indicate that COP1 is required to repress the AtMYB21 gene in seedlings, and the pleiotropic phenotypes shown in the cap1 mutant are due to the combination of misregulation of genuine light-signalling components and other tissue-specific factors.

Original languageEnglish
Pages (from-to)23-32
Number of pages10
JournalPlant Journal
Issue number1
Publication statusPublished - 2002
Externally publishedYes


  • AtMYB21
  • COP1
  • Flower
  • PAL
  • Photomorphogenesis

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology


Dive into the research topics of 'AtMYB21, a gene encoding a flower-specific transcription factor, is regulated by COP1'. Together they form a unique fingerprint.

Cite this