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Sci. Signal., 12 May 2009
Vol. 2, Issue 70, p. pe31
[DOI: 10.1126/scisignal.270pe31]


The Quest for Long-Distance Signals in Plant Systemic Immunity

Jane E. Parker*

Department of Plant-Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linné Weg 10, 50829 Cologne, Germany.

Abstract: Plants induce long-lasting systemic immunity after local pathogen attack by emitting resistance-priming signals from infection sites. A number of plant molecules have been proposed as mobile factors for this response, but many do not fully satisfy criteria for timing and action in systemic immunity. Azelaic acid has been identified as a pathogen-induced metabolite in Arabidopsis vascular sap that has several properties of a long-distance resistance-priming signal.

* Corresponding author. E-mail, parker{at}

Citation: J. E. Parker, The Quest for Long-Distance Signals in Plant Systemic Immunity. Sci. Signal. 2, pe31 (2009).

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