A central role of salicylic acid in plant disease resistance

Terrence P. Delaney, Scott Uknes, Bernard Vernooij, Leslie Friedrich, Kris Weymann, David Negrotto, Thomas Gaffney, Manuela Gut-Rella, Helmut Kessmann, Eric Ward, John Ryals

Research output: Contribution to journalArticlepeer-review

1358 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1247-1250
Number of pages4
Issue number5188
StatePublished - 1994
Externally publishedYes

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