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Targets of the WRKY53 transcription factor and its role during leaf senescence in Arabidopsis

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Abstract

Arabidopsis WRKY proteins comprise a family of plant specific zinc-finger-type transcription factors involved in the regulation of gene expression during pathogen defense, wounding, trichome development, and senescence. To understand the regulatory role of the senescence-related WRKY53 factor, we identified target genes of this transcription factor by a pull down assay using genomic DNA and recombinant WRKY53 protein. We isolated a number of candidate target genes including other transcription factors, also of the WRKY family, stress- and defence related genes, and senescence-associated genes (SAGs). WRKY53 protein could bind to these different promoters in vitro and in vivo and it could act either as transcriptional activator or transcriptional repressor depending on the sequences surrounding the W-boxes. Overexpression, RNAi and knock-out lines showed accelerated and delayed senescence phenotypes, respectively, and exhibited altered expression levels of the target genes. WRKY53 can be induced by H2O2 and can regulate its own expression in a negative feed back loop. Our results suggest that WRKY53 acts in a complex transcription factor signalling network regulating senescence specific gene expression and that hydrogen peroxide might be involved in signal transduction.

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Authors and Affiliations

  1. ZMBP (Centre of Molecular Biology of Plants), Department of General Genetics, University Tübingen, Auf der Morgenstelle 28, 72076, Tübingen, Germany

    Y. Miao, T. Laun, P. Zimmermann & U. Zentgraf

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  1. Y. Miao
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  2. T. Laun
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  3. P. Zimmermann
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  4. U. Zentgraf
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Correspondence to U. Zentgraf.

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Miao, Y., Laun, T., Zimmermann, P. et al. Targets of the WRKY53 transcription factor and its role during leaf senescence in Arabidopsis . Plant Mol Biol 55, 853–867 (2004). https://doi.org/10.1007/s11103-005-2142-1

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  • DOI: https://doi.org/10.1007/s11103-005-2142-1

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