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STY1 and STY2 promote the formation of apical tissues during Arabidopsis gynoecium development

Kuusk, Sandra and Sohlberg, Joel J. and Long, Jeff A. and Fridborg, Ingela and Sundberg, Eva (2002) STY1 and STY2 promote the formation of apical tissues during Arabidopsis gynoecium development. Development, 129 (20). pp. 4707-4717. ISSN 0950-1991.

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Gynoecium ontogenesis in Arabidopsis is accomplished by the co-ordinated activity of genes that control patterning and the regional differentiation of tissues, and ultimately results in the formation of a basal ovary, a short style and an apical stigma. A transposon insertion in the STYLISH1 (STY1) gene results in gynoecia with aberrant style morphology, while an insertion mutation in the closely related STYLISH2 (STY2) gene has no visible effect on gynoecium development. However, sty1-1 sty2-1 double mutant plants exhibit an enhanced sty1-1 mutant phenotype and are characterized by a further reduction in the amount of stylar and stigmatic tissues and decreased proliferation of stylar xylem. These data imply that STY1 and STY2 are partially redundant and that both genes promote style and stigma formation and influence vascular development during Arabidopsis gynoecium development. Consistently, STY1 and STY2 are expressed in the apical parts of the developing gynoecium and ectopic expression of either STY1 or STY2 driven by the CaMV 35S promoter is sufficient to transform valve cells into style cells. STY1::GUS and STY2::GUS activity is detected in many other organs as well as the gynoecium, suggesting that STY1 and STY2 may have additional functions. This is supported by the sty1-1 sty2-1 double mutants producing rosette and cauline leaves with a higher degree of serration than wild-type leaves. STY1 and STY2 are members of a small gene family, and encode proteins with a RING finger-like motif. Double mutant analyses indicate that STY1 genetically interacts with SPATULA and possibly also with CRABS CLAW.

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Additional Information:© 2002 The Company of Biologists Limited. Accepted 10 July 2002. We are grateful to John Bowman for helpful comments on the manuscript. We thank Gun-Britt Berglund and Agneta Ottosson for skilful technical assistance, Eva Büren, Marie Lindersson and Caisa Pöntinen for sequencing, and Annette Axén, Stefan Gunnarsson and Gary Wife for help with the microscopy studies. We acknowledge The Wallenberg Consortium North Arabidopsis model organism platform in Uppsala for assistance in the production of transgenic plants and the Sainsbury Laboratory (Norwich, UK) for providing seeds and DNA from the SLAT collection. This work was supported by grants from the Swedish Council for Forestry and Agricultural Research and from the European Community Contract QLG2-CT-1999-00876 (REGIA, to P. Engström).
Funding AgencyGrant Number
Swedish Council for Forestry and Agricultural ResearchUNSPECIFIED
European CommunityQLG2-CT-1999-00876
Subject Keywords:Arabidopsis thaliana; gynoecium; style; STYLISH1
Issue or Number:20
Record Number:CaltechAUTHORS:20111019-105539832
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27306
Deposited By: Tony Diaz
Deposited On:24 Oct 2011 22:33
Last Modified:03 Oct 2019 03:22

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