A homeodomain leucine zipper gene from Craterostigma plantagineum regulates abscisic acid responsive gene expression and physiological responses
2006
Deng, X. | Phillips, J. | Brautigam, A. | Engstrom, P. | Johannesson, H. | Ouwerkerk, Pieter B.F. | Ruberti, I. | Salinas, Julio | Vera, P. | Iannacone, R. | Meijer, A.M. | Bartels, Dorothea | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
21 p,- 6 fig., 3 tab.
Show more [+] Less [-]A 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
Show more [+] Less [-]The work was supported by the EU 5th framework project TF-STRESS (QLK3-CT-2000-00328)
Show more [+] Less [-]Peer reviewed
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