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Auxin and STY genes in Arabidopsis gynoecium development
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Evolutionary Biology, Physiological Botany.
Manuscript (Other academic)
URN: urn:nbn:se:uu:diva-90224OAI: oai:DiVA.org:uu-90224DiVA: diva2:162509
Available from: 2003-04-15 Created: 2003-04-15 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Control of Pistil Development in Arabidopsis thaliana by a Novel Class of Regulatory Genes
Open this publication in new window or tab >>Control of Pistil Development in Arabidopsis thaliana by a Novel Class of Regulatory Genes
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. 50 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 827
Biology, Biologi
National Category
Biological Sciences
Research subject
Physiological Botany
urn:nbn:se:uu:diva-3366 (URN)91-554-5593-X (ISBN)
Public defence
2003-05-09, lecture hall, room 3041, Department of Physiological Botany, 752 36 Uppsala, 10:00
Available from: 2003-04-15 Created: 2003-04-15Bibliographically approved

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