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Gene Review

MYB21  -  transcription factor MYB21

Arabidopsis thaliana

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High impact information on ATMYB21

  • Two of these transcription factors, MYB21 and MYB24, are the only members of subgroup 19 of the R2R3 family of MYB proteins [1].
  • Exogenous jasmonate could not restore fertility to myb21 or myb21myb24 mutant plants [1].
  • A myb24 mutant was phenotypically wild-type, but production of a myb21myb24 double mutant indicated that introduction of the myb24 mutation exacerbated all three aspects of the myb21 phenotype [1].
  • A myb21 mutant obtained by reverse genetics exhibited shorter anther filaments, delayed anther dehiscence and greatly reduced male fertility [1].
  • The results indicate that COP1 is required to repress the AtMYB21 gene in seedlings, and the pleiotropic phenotypes shown in the cop1 mutant are due to the combination of misregulation of genuine light-signalling components and other tissue-specific factors [2].

Associations of ATMYB21 with chemical compounds

  • Analysis shows that dark-grown transgenic seedlings expressing AtMYB21-GR fusion protein display some features of the cop1 mutant, including decreased hypocotyl cell expansion, open cotyledons in the dark, and seedling lethality in the presence of dexamethasone [2].

Other interactions of ATMYB21

  • AtMYB21, a gene encoding a flower-specific transcription factor, is regulated by COP1 [2].


  1. Transcriptional regulators of stamen development in Arabidopsis identified by transcriptional profiling. Mandaokar, A., Thines, B., Shin, B., Markus Lange, B., Choi, G., Koo, Y.J., Yoo, Y.J., Choi, Y.D., Choi, G., Browse, J. Plant J. (2006) [Pubmed]
  2. AtMYB21, a gene encoding a flower-specific transcription factor, is regulated by COP1. Shin, B., Choi, G., Yi, H., Yang, S., Cho, I., Kim, J., Lee, S., Paek, N.C., Kim, J.H., Song, P.S., Choi, G. Plant J. (2002) [Pubmed]
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