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Gene Review

HB6  -  homeobox-leucine zipper protein ATHB-6

Arabidopsis thaliana

Synonyms: ATHB6, F14M13.17, F14M13_17, homeobox protein 6
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High impact information on ATHB6

  • In addition, transgenic plants containing a luciferase gene controlled by the ATHB6 promoter documented a strong ABA-inducible expression of the reporter which was abrogated in the ABA-insensitive abi1 mutant [1].
  • ATHB6 recognizes a cis-element present in its promoter, which encompasses the core motif (CAATTATTA) that mediated ATHB6- and ABA-dependent gene expression in protoplasts [1].
  • The induction was ABA-dependent, since no increase in ATHB6 transcript was detected in the ABA-deficient mutant aba-3 subjected to drought treatment [2].
  • We have characterized one HD-Zip gene, ATHB6, from Arabidopsis thaliana [2].
  • ATHB6 was expressed constitutively in seedlings, but significantly up-regulated in seedlings subjected to water deficit, osmotic stress or exogenous treatment with abscisic acid (ABA), an induction being detectable within 30 min [2].

Biological context of ATHB6

  • A translational fusion of the ATHB6 promoter with the reporter gene GUS (ATHB6::GUS) in transgenic A. thaliana plants showed high-level expression in leaf primordia [2].
  • These expression data suggest ATHB6 to have a function related to cell division and/or differentiation in developing organs [2].
  • These results suggest that ATHB6 may act downstream to both ABI1 and ABI2 in a signal transduction pathway mediating a drought stress response [2].

Other interactions of ATHB6


  1. Homeodomain protein ATHB6 is a target of the protein phosphatase ABI1 and regulates hormone responses in Arabidopsis. Himmelbach, A., Hoffmann, T., Leube, M., Höhener, B., Grill, E. EMBO J. (2002) [Pubmed]
  2. The HD-Zip gene ATHB6 in Arabidopsis is expressed in developing leaves, roots and carpels and up-regulated by water deficit conditions. Söderman, E., Hjellström, M., Fahleson, J., Engström, P. Plant Mol. Biol. (1999) [Pubmed]
  3. Primary phloem-specific expression of a Zinnia elegans homeobox gene. Nishitani, C., Demura, T., Fukuda, H. Plant Cell Physiol. (2001) [Pubmed]
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