ARS | Publication request: SA- AND NO- MEDIATED SIGNALLING IN PLANT DISEASE RESISTANCE

Submitted to: Biology of Plant Microbe Interactions
Publication Type: Book / Chapter
Publication Acceptance Date: September 9, 2001
Publication Date: March 2, 2002
Citation: Klessig, D.F., Kachroo, P., Slaymaker, D., Yoshioka, K., Navarre, D.A., Clark, D.A., Kumar, D., Shah, J. 2002. SA- and NO- mediated signaling in plant disease resistance. In: Biology of Plant-Microbe Interactions. S.A. Leong, C. Allen, and W.W. Triplett, eds., Int'l Soc. Mol. Plant-Microbe Interactions, St. Paul, MN. pp. 78-82.

Technical Abstract: Salicylic acid and nitric oxide mediated signalling are two key regulators of plant disease resistance mechanisms. Using multiple Arabidopsis mutants that are positive or negative regulators of the SA response we are dissecting the signal transduction chain. To elucidate the components associated with NPR1-independent defense signaling, we isolated a suppressor of the npr1-5 allele, designated ssi2. The recessive ssi2 mutation confers constitutive PR gene expression, spontaneous lesion formation, and enhanced resistance to Peronospora parasitica. A SA binding protein was purified and identified as carbonic annhydrase and likely is involved in oxidative stress tolerance. Nitric oxide was shown to inhibit aconitase, and also catalase and ascorbate peroxidase.