The Arabidopsis Athb-2 and -4 genes are strongly induced by far-red-rich light

Plant J. 1993 Sep;4(3):469-79. doi: 10.1046/j.1365-313x.1993.04030469.x.


The isolation and characterization of the Athb-2 gene, which codes for a HD-Zip protein in Arabidopsis thaliana is reported. Interestingly, Southern analysis has established that the Arabidopsis genome contains sequences which are highly related to the Athb-2 HD-Zip coding region. One of these genes, designated Athb-4, has been cloned and partially sequenced. Amino acid sequence comparison revealed that Athb-2 and -4 are members of a small family of HD-Zip related proteins. Athb-2 mRNA analysis showed that this gene is expressed during the vegetative and reproductive phases of plant growth. A significant increment in the amount of Athb-2 transcripts was observed in flowering plants. A higher steady-state level of the Athb-2 mRNA was also found in dark-adapted plants. Remarkably, far-red-rich light treatment of Arabidopsis plants results in a rapid and strong induction of the Athb-2 expression. This light treatment also induces the accumulation of Athb-4 transcripts, suggesting a similar role for the two members of this HD-Zip family.

Publication types

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

MeSH terms

  • Amino Acid Sequence
  • Arabidopsis / genetics*
  • Arabidopsis / radiation effects
  • Arabidopsis Proteins*
  • Base Sequence
  • DNA / genetics
  • DNA-Binding Proteins / genetics
  • Gene Expression Regulation / radiation effects
  • Genes, Homeobox
  • Genes, Plant / radiation effects*
  • Homeodomain Proteins
  • Leucine Zippers / genetics
  • Light
  • Molecular Sequence Data
  • Plant Proteins / genetics
  • Sequence Homology, Amino Acid


  • Arabidopsis Proteins
  • DNA-Binding Proteins
  • HB-2 protein, Arabidopsis
  • Homeodomain Proteins
  • Plant Proteins
  • DNA

Associated data

  • GENBANK/X68145
  • GENBANK/X68146