uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
HDZip I Transcription Factors in Arabidopsis thaliana: Expression and Function in Relation to Environmental Stress Conditions
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Physiological Botany.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The homeodomain leucine zipper (HDZip) proteins constitute a plant-specific family of transcription factors, that based on sequence criteria have been grouped into four classes, HDZip I-IV. This thesis describes the phylogeny, function, expression patterns and regulation of the HDZip class I genes in the model species Arabidopsis thaliana.

The phylogenetic analyses, traced duplication history and exon/intron organisation of the 17 class I genes in Arabidopsis show that the genes form six monophyletic groups, clades, with an origin in early plant evolution. All genes are expressed in broad tissue distribution patterns and the majority are responsive to water availability and/or light conditions. The expression of the genes show different patterns and dependence on environmental stress conditions, indicating evolutionary changes within and between clades. Ectopic expression of the genes suggest that they regulate genes in part by conserved mechanisms. Therefore, different functional roles seem to have evolved by a divergence mainly in the regulatory properties of the genes.

Detailed expression analyses of the paralogous HDZip I genes ATHB7 and ATHB12 show that they have essentially overlapping patterns of activity in response to abscisic acid, ABA, or water deficit in leaves, stems and roots. The water deficit response of ATHB7 and -12 is mediated by ABA and depends on the protein phosphateses ABI1 and ABI2. Transgenic plants with ectopic expression of ATHB7 and/or -12, and athb7 and athb12 mutants, reveal that the genes in roots mediate the growth inhibitory effects of ABA. In this aspect of their function they do not overlap. In leaves and stems, the genes might act as growth regulators redundantly with other factors.

Taken together these data suggest that ATHB7 and -12 regulate growth in response water deficit and that other HDZip I genes have related functions in response to environmental stress conditions.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2005. , p. 52
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 13
Keywords [en]
Biology, homeodomain leucine zipper, ABA, transcription factor, water deficit, Arabidopsis thaliana
Keywords [sv]
Biologi
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-4787ISBN: 91-554-6150-6 (print)OAI: oai:DiVA.org:uu-4787DiVA, id: diva2:165768
Public defence
2005-03-18, Lecture Hall, room 3041, Department of Physiological Botany, Villavägen 6, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2005-02-21 Created: 2005-02-21 Last updated: 2009-04-02Bibliographically approved
List of papers
1. Class I HDZip genes in Arabidopsis: expression patterns and phylogeny
Open this publication in new window or tab >>Class I HDZip genes in Arabidopsis: expression patterns and phylogeny
Show others...
(English)Manuscript (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-92617 (URN)
Available from: 2005-02-21 Created: 2005-02-21 Last updated: 2010-01-14Bibliographically approved
2. Constitutive expression of the water deficit-inducible homeobox gene ATHB7 in transgenic Arabidopsis causes a suppression of stem elongation growth
Open this publication in new window or tab >>Constitutive expression of the water deficit-inducible homeobox gene ATHB7 in transgenic Arabidopsis causes a suppression of stem elongation growth
2003 (English)In: Plant, Cell and Environment, ISSN 0140-7791, no 26, p. 1127-1136Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92618 (URN)
Available from: 2005-02-21 Created: 2005-02-21 Last updated: 2009-04-02Bibliographically approved
3. The homeobox genes ATHB12 and ATHB7 encode potential regulators of growth in response to water deficit in Arabidopsis
Open this publication in new window or tab >>The homeobox genes ATHB12 and ATHB7 encode potential regulators of growth in response to water deficit in Arabidopsis
2004 (English)In: Plant Molecular Biology, ISSN 0167-4412, no 55, p. 663-677Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92619 (URN)
Available from: 2005-02-21 Created: 2005-02-21 Last updated: 2009-04-02Bibliographically approved
4. Involvement of the HDZip genes ATHB7 and ATHB12 in ABA related responses in Arabidopsis
Open this publication in new window or tab >>Involvement of the HDZip genes ATHB7 and ATHB12 in ABA related responses in Arabidopsis
(English)Manuscript (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-92620 (URN)
Available from: 2005-02-21 Created: 2005-02-21 Last updated: 2010-01-14Bibliographically approved

Open Access in DiVA

fulltext(911 kB)1533 downloads
File information
File name FULLTEXT01.pdfFile size 911 kBChecksum MD5
3504af56aeae245c7032589794438194765fa3846497cf31b38945230bd709c1a01e84f8
Type fulltextMimetype application/pdf
Buy this publication >>

By organisation
Physiological Botany
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 1533 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1445 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf