Evidence for an important role of WRKY DNA binding proteins in the regulation of NPR1 gene expression. Export

@article{citeulike:2158072, abstract = {The Arabidopsis NPR1 gene is a positive regulator of inducible plant disease resistance. Expression of NPR1 is induced by pathogen infection or treatment with defense-inducing compounds such as salicylic acid (SA). Transgenic plants overexpressing NPR1 exhibit enhanced resistance to a broad spectrum of microbial pathogens, whereas plants underexpressing the gene are more susceptible to pathogen infection. These results suggest that regulation of NPR1 gene expression is important for the activation of plant defense responses. In the present study, we report the identification of W-box sequences in the promoter region of the NPR1 gene that are recognized specifically by SA-induced WRKY DNA binding proteins from Arabidopsis. Mutations in these W-box sequences abolished their recognition by WRKY DNA binding proteins, rendered the promoter unable to activate a downstream reporter gene, and compromised the ability of NPR1 to complement npr1 mutants for SA-induced defense gene expression and disease resistance. These results provide strong evidence that certain WRKY genes act upstream of NPR1 and positively regulate its expression during the activation of plant defense responses. Consistent with this model, we found that SA-induced expression of a number of WRKY genes was independent of NPR1.}, address = {Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA.}, author = {Yu, D. and Chen, C. and Chen, Z.}, citeulike-article-id = {2158072}, citeulike-linkout-0 = {http://view.ncbi.nlm.nih.gov/pubmed/11449049}, citeulike-linkout-1 = {http://www.hubmed.org/display.cgi?uids=11449049}, issn = {1040-4651}, journal = {Plant Cell}, keywords = {npr1, promoter}, month = {July}, number = {7}, pages = {1527--1540}, posted-at = {2007-12-22 02:17:35}, priority = {2}, title = {Evidence for an important role of WRKY DNA binding proteins in the regulation of NPR1 gene expression.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/11449049}, volume = {13}, year = {2001} }

TY - JOUR ID - citeulike:2158072 L3 - citeulike-article-id:2158072 N2 - The Arabidopsis NPR1 gene is a positive regulator of inducible plant disease resistance. Expression of NPR1 is induced by pathogen infection or treatment with defense-inducing compounds such as salicylic acid (SA). Transgenic plants overexpressing NPR1 exhibit enhanced resistance to a broad spectrum of microbial pathogens, whereas plants underexpressing the gene are more susceptible to pathogen infection. These results suggest that regulation of NPR1 gene expression is important for the activation of plant defense responses. In the present study, we report the identification of W-box sequences in the promoter region of the NPR1 gene that are recognized specifically by SA-induced WRKY DNA binding proteins from Arabidopsis. Mutations in these W-box sequences abolished their recognition by WRKY DNA binding proteins, rendered the promoter unable to activate a downstream reporter gene, and compromised the ability of NPR1 to complement npr1 mutants for SA-induced defense gene expression and disease resistance. These results provide strong evidence that certain WRKY genes act upstream of NPR1 and positively regulate its expression during the activation of plant defense responses. Consistent with this model, we found that SA-induced expression of a number of WRKY genes was independent of NPR1. IS - 7 JF - Plant Cell SN - 1040-4651 AD - Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA. EP - 1540 TI - Evidence for an important role of WRKY DNA binding proteins in the regulation of NPR1 gene expression. VL - 13 SP - 1527 KW - npr1 KW - promoter AU - Yu, D AU - Chen, C AU - Chen, Z PY - 2001/07// UR - http://view.ncbi.nlm.nih.gov/pubmed/11449049 ER -