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Hahb-4, a homeobox-leucine zipper gene potentially involved in abscisic acid-dependent responses to water stress in sunflower

AuthorsGago, G. M.; Almoguera, Concepción CSIC ORCID ; Jordano, Juan CSIC ORCID ; González, D. H.; Chang, R. L.
KeywordsHelianthus annuus
Drought stress
Plant transcription factor
Water deficit
Issue Date3-May-2002
PublisherBlackwell Publishing
CitationPlant Cell and Environment 25: (5) 633–640, (2002)
AbstractHomeodomain-leucine zipper proteins constitute a family of transcription factors found only in plants. We have characterized a full-length cDNA encoding the sunflower homeobox-leucine zipper protein Hahb-4 (Helianthus annuus homeo box-4). The complete cDNA is 674 base pairs long and contains an open reading frame of 177 amino acids that belongs to the Hd-Zip I subfamily. Northern blot and RNAse A protection analysis show that the expression of Hahb-4 is rapidly, strongly and reversibly induced by water deficit in whole seedlings, roots, stems and leaves. A similar fast induction of Hahb-4 expression is observed when seedlings are subjected to a treatment with the hormone abscisic acid (ABA). Nuclei prepared from seedlings treated with ABA or subjected to water stress show a significant increase of protein(s) that specifically bind the sequence 5′-CAAT(A/T)ATTG-3′, recognized in vitro by Hahb-4, suggesting that an active protein is synthesized in response to these treatments. The promoter region of the Hahb-4 gene contains sequences that fit the consensus for a G-box present in some ABA responsive elements (ABREs). We propose that Hahb-4 may function in signalling cascade(s) that control(s) a subset of the ABAmediated responses of sunflower to water stress.
DescriptionThe nucleotide sequence data reported will appear in the EMBL, GenBank and DDBJ Nucleotide Sequence Databases under the accession numbers AF339748 and AF339749.
Publisher version (URL)http://dx.doi.org/10.1046/j.1365-3040.2002.00853.x
Appears in Collections:(IRNAS) Artículos
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