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A homeodomain leucine zipper gene from Craterostigma plantagineum regulates abscisic acid responsive gene expression and physiological responses

AuthorsDeng, X.; Phillips, J.; Brautigam, A.; Engstrom, P.; Johannesson, H.; Ouwerkerk, P.B.F.; Ruberti, I.; Salinas, Julio ; Vera, P.; Iannacone, R.; Meijer, A.M.; Bartels, D.
KeywordsAbscisic acid
Craterostigma plantagineum
dehydration tolerance
homeodomain leucine zipper
Issue DateJun-2006
CitationPlant Molecular Biology 61 (3): 469-489 (2006)
AbstractA subset of homeodomain leucine zipper proteins (HDZip) play a role in regulating adaptation responses including developmental adjustment to environmental cues in plants. Here we report the structural and functional characterisation of a dehydration responsive nuclear-targeted HDZip transcriptional regulator, CpHB-7. DNA–protein interaction studies suggest that CDeT6-19, a known ABA and dehydration responsive dehydrin gene, is a potential target gene of CpHB-7 in the desiccation-tolerant plant Craterostigma plantagineum. Transgenic plants that ectopically express CpHB-7 display reduced sensitivity towards ABA during seed germination and stomatal closure. Expression analysis reveals that genes with induced or repressed expression in CpHB-7 ectopic expression lines are either mostly repressed or induced by ABA, drought or salt treatment respectively, thus demonstrating that CpHB-7 modifies ABA-responsive gene expression as a negative regulator. CpHB-7 gene expression is also linked to early organ development, leading to the suggestion that CpHB-7 is functionally similar to the Arabidopsis transcription factor, ATHB-6
Description21 p,- 6 fig., 3 tab.
Publisher version (URL)https://dx.doi.org/10.1007/s11103-006-0023-x
Appears in Collections:(CIB) Artículos
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