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Control of Pistil Development in Arabidopsis thaliana by a Novel Class of Regulatory Genes
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Evolutionary Biology, Physiological Botany.
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The pistil, or the gynoecium, is the female reproductive organ of the angiosperm flower and its ontogeny has been studied in the model plant Arabidopsis thaliana. The mature Arabidopsis gynoecium consists of a basal ovary that contains the ovules, a short style and an apical stigma that serves as the site of pollen adherence and germination. This thesis describes the identification and functional characterisation of genes with roles in the regulation of Arabidopsis gynoecium development.

Mutant analyses and sequence similarity database searches led to the identification of a small Arabidopsis gene family, denoted the SHI gene family, the ten members of which encode proteins with zinc finger-like motifs. This class of genes is novel and appears to be unique to plants.

Double, triple and quadruple mutant analyses revealed that at least six of the SHI-related genes, STY1, STY2, SHI, SRS4, SRS5, and LRP1, redundantly contribute to the formation of stylar and stigmatic tissues in developing gynoecia. Several of the genes appear also to influence carpel fusion and vascular patterning in the gynoecium. Gynoecia of transgenic plants that express STY1 or STY2 constitutively develop ectopic style cells, confirming a role for the genes in the promotion of style formation. STY1, STY2, SHI and SRS5 are expressed in the apical parts of the developing gynoecium and, hence, likely act cell autonomously. As judged from mutant and overexpression analyses, the SHI-related genes appear also to regulate leaf development. Possibly, SHI family members act in concert with the plant growth hormones gibberellin and auxin.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2003. , p. 50
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 827
Keywords [en]
Biology
Keywords [sv]
Biologi
National Category
Biological Sciences
Research subject
Physiological Botany
Identifiers
URN: urn:nbn:se:uu:diva-3366ISBN: 91-554-5593-X (print)OAI: oai:DiVA.org:uu-3366DiVA, id: diva2:162510
Public defence
2003-05-09, lecture hall, room 3041, Department of Physiological Botany, 752 36 Uppsala, 10:00
Opponent
Supervisors
Available from: 2003-04-15 Created: 2003-04-15Bibliographically approved
List of papers
1. The Arabidopsis dwarf mutant shi exhibits reduced gibberellin responses conferred by overexpression of a new putative zinc finger protein
Open this publication in new window or tab >>The Arabidopsis dwarf mutant shi exhibits reduced gibberellin responses conferred by overexpression of a new putative zinc finger protein
1999 In: Plant Cell, Vol. 11, no 6, p. 1019-1031Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-90220 (URN)
Available from: 2003-04-15 Created: 2003-04-15Bibliographically approved
2. The Arabidopsis protein SHI represses gibberellin responses in Arabidpsis and Barley.
Open this publication in new window or tab >>The Arabidopsis protein SHI represses gibberellin responses in Arabidpsis and Barley.
2001 In: Plant Physiology, Vol. 127, no 3, p. 937-948Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-90221 (URN)
Available from: 2003-04-15 Created: 2003-04-15Bibliographically approved
3. STY1 and STY2 promote the formation of apical tissues during Arabidopsis gynoecium development
Open this publication in new window or tab >>STY1 and STY2 promote the formation of apical tissues during Arabidopsis gynoecium development
Show others...
2002 In: Development, Vol. 129, no 20, p. 4707-4717Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-90222 (URN)
Available from: 2003-04-15 Created: 2003-04-15Bibliographically approved
4. Control of gynoecium development by STYLISH genes
Open this publication in new window or tab >>Control of gynoecium development by STYLISH genes
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-90223 (URN)
Available from: 2003-04-15 Created: 2003-04-15 Last updated: 2010-01-13Bibliographically approved
5. Auxin and STY genes in Arabidopsis gynoecium development
Open this publication in new window or tab >>Auxin and STY genes in Arabidopsis gynoecium development
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-90224 (URN)
Available from: 2003-04-15 Created: 2003-04-15 Last updated: 2010-01-13Bibliographically approved

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