A Central Role of Salicylic Acid in Plant Disease Resistance
Terrence P. Delaney(North Carolina Biotechnology Center), Scott Uknes(North Carolina Biotechnology Center), Bernard Vernooij(North Carolina Biotechnology Center), Leslie Friedrich(North Carolina Biotechnology Center), Kris Weymann(North Carolina Biotechnology Center), David Negrotto(North Carolina Biotechnology Center), Thomas Gaffney(North Carolina Biotechnology Center), Manuela Gut-Rella(Novartis (Switzerland)), Helmut Keßmann(Novartis (Switzerland)), E. R. Ward(North Carolina Biotechnology Center), John Ryals(North Carolina Biotechnology Center)
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Abstract
Transgenic tobacco and Arabidopsis thaliana expressing the bacterial enzyme salicylate hydroxylase cannot accumulate salicylic acid (SA). This defect not only makes the plants unable to induce systemic acquired resistance, but also leads to increased susceptibility to viral, fungal, and bacterial pathogens. The enhanced susceptibility extends even to host-pathogen combinations that would normally result in genetic resistance. Therefore, SA accumulation is essential for expression of multiple modes of plant disease resistance.
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