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Systemic Acquired Resistance and Induced Systemic Resistance in Conventional Agriculture

Gary E. Vallada and Robert M. Goodmanb,*

a Dep. of Plant Pathology, Univ. of California–Davis, c/o U.S. Agriculture Research Station, 1636 E. Alisal St., Salinas, CA 93905
b Dep. of Plant Pathology and Gaylord Nelson Institute for Environmental Studies, Univ. of Wisconsin, Madison, WI 53706



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  		Fig. 1. A pictorial comparison of the two best characterized forms of induced resistance in plants, both which lead to similar phenotypic responses. Systemic acquired resistance, induced by the exposure of root or foliar tissues to abiotic or biotic elicitors, is dependent of the phytohormone salicylate (salicylic acid), and associated with the accumulation of pathogenesis-related (PR) proteins. Induced systemic resistance, induced by the exposure of roots to specific strains of plant growth-promoting rhizobacteria, is dependent of the phytohormones ethylene and jasmonate (jasmonic acid), independent of salicylate, and is not associated with the accumulation of PR proteins (or transcripts). However, both responses are intertwined molecularly, as demonstrated by their reliance on a functional version of the gene NPR1 in Arabidopsis thaliana.

 




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