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Regulation of organ development by auxin and the SHI/STY-family of transcriptional regulators

Ståldal, Veronika (2011). Regulation of organ development by auxin and the SHI/STY-family of transcriptional regulators. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2011:14
ISBN 978-91-576-7549-1
[Doctoral thesis]

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Transcription factors, proteins regulating the transcription of target genes, and plant hormones play important roles in the regulation of plant development. The plant hormone auxin has been assigned functions in many developmental processes and its differential distribution between cells, created mainly by local auxin biosynthesis and polar auxin transport, results in auxin maxima and gradients, which appear to be important for its role in developmental regulation. The work in this thesis reveals that members of the Arabidopsis thaliana SHI/STY protein family, which redundantly regulates the development of lateral organs, act as DNA binding transcriptional activators. The SHI/STY member STY1, expressed at specific sites in developing primordia and organs, binds to the promoter of the YUC4 auxin biosynthesis gene. Our data suggest that the control of local auxin biosynthesis, through transcriptional activation of e.g. YUC4, is important for SHI/STY regulated development of lateral organs. We could show that local auxin application restores SHI/STY mutant style defects. Furthermore, using a polar auxin transport inhibitor, auxin was found to act independently of the style-promoting factors CRC, LUG, SEU, SPT and STY1 in style development, suggesting that auxin may act downstream or in parallel with these genes, but not in apical-basal patterning of the gynoecium. Additional STY1 downstream targets have been identified and include genes encoding transcription factors, another auxin biosynthesis enzyme, and enzymes involved in cell expansion. Functional studies on some of these genes reveal roles in stamen and leaf development as well as in flowering time regulation. The upstream regulation of SHI/STY genes has also been studied and a conserved GCC-box-like promoter element has been shown to be important for the transcriptional regulation of SHI/STY genes, providing a possible mechanism for the co-regulation of the SHI/STY protein accumulation.

Authors/Creators:Ståldal, Veronika
Title:Regulation of organ development by auxin and the SHI/STY-family of transcriptional regulators
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2011
Number of Pages:66
ALLI. Ståldal, V*., Sohlberg, J.J*., Eklund, D.M., Ljung, K. & Sundberg, E. (2008). Auxin can act independently of CRC, LUG, SEU, SPT and STY1 in style development but not apical-basal patterning of the Arabidopsis gynoecium. New Phytologist 180, 798-808. II. Eklund, D.M., Ståldal, V., Valsecci, I., Cierlik, I., Eriksson, C., Hiratsu, K., Ohme-Takagi, M., Sundström, J.F., Thelander, M., Ezcurra, I. & Sundberg, E. (2010). The Arabidopsis thaliana STYLISH1 protein acts as a transcriptional activator regulating auxin biosynthesis. Plant Cell 22(2), 349-363. III. Ståldal, V., Cierlik, I., Chen, S., Landberg, K., Baylis, T., Myrenås, M., Sundström, J., Eklund, D.M., Ljung, K. & Sundberg, E. The Arabidopsis thaliana transcriptional activator STYLISH1 regulates genes affecting stamen development, cell expansion and timing of flowering (manuscript). IV. Eklund, D.M*., Cierlik, I*., Ståldal, V., Vestman, D., Chandler, J. & Sundberg, E. Expression of SHORT INTERNODES/STYLISH family genes in auxin biosynthesis zones of aerial organs is dependent on a GCC-box-like regulatory element (manuscript). * Indicates shared first authorship
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7549-1
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:auxins, arabidopsis thaliana, gynoecium, leaves, stamens, biosynthesis, genes, transcription, transcription factors
Keywords:Arabidopsis thaliana, auxin, gynoecium, leaf, organ development, SHI/STY-family, stamen, STYLISH1, transcriptional activator, YUCCA4
Permanent URL:
ID Code:2446
Department:(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
Deposited By: Veronika Ståldal
Deposited On:01 Mar 2011 00:00
Metadata Last Modified:02 Dec 2014 10:18

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