Biologia plantarum 57:341-350, 2013 | DOI: 10.1007/s10535-012-0281-1

Identification of promoter regions in the Arabidopsis thaliana atExt1 extensin gene controlling late responses to wounding and pathogen attack

K. Roberts1, G. Merkouropoulos1,2, A. H. Shirsat1,*
1 School of Biological Sciences, College of Natural Sciences, Bangor University, Bangor, Gwynedd, UK
2 Institute of Agrobiotechnology, CERTH, Thermi, Thessaloniki, Greece

The Arabidopsis thaliana (L.) Heynh. atExt1 extensin gene is expressed in a cell and tissue-specific manner, in response to developmental cues, and is inducible by a wide range of biotic and abiotic stresses. Over-expression of this gene has been shown to alter stem morphology and to limit the invasiveness of virulent bacterial pathogens, indicating that this cell wall protein gene plays an important role in plant development and defense. A detailed sequence analysis of 3.2 kb of the atExt1 gene promoter region has identified a large number of putative 5'cis-acting elements. Based on the location of clusters of putative promoter control elements, seven atExt1 5' promoter truncations were constructed, fused upstream of the β-glucuronidase (GUS) reporter gene, and transformed into A. thaliana. Transgenic plants carrying the various promoter constructs were challenged by wounding and pathogen attack and analysed for GUS expression - this analysis revealed a complex pattern of regulation, involving positive and negative control regions. Northern analysis using wounded tissues from transgenic Arabidopsis plants carrying the 3.2 kb-promoter::GUS construct confirmed the transcriptional activation of the transgene.

Keywords: β-glucuronidase; Northern blot; promoter truncations; transgenic plant
Subjects: gene promoter; extensin; wounding; pathogens; Northern blot; transgenic plants; β-glucuronidase; gene sequence; gene expression
Species: Arabidopsis thaliana

Received: July 27, 2011; Accepted: August 6, 2012; Published: June 1, 2013Show citation

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Roberts, K., Merkouropoulos, G., & Shirsat, A.H. (2013). Identification of promoter regions in the Arabidopsis thaliana atExt1 extensin gene controlling late responses to wounding and pathogen attack. Biologia plantarum, 57(2), 341-350. doi: 10.1007/s10535-012-0281-1.
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