SOS - too many signals for systemic acquired resistance?
D'Maris Amick Dempsey1, Daniel F Klessig
1Boyce Thompson Institute for Plant Research, Ithaca, NY 14853, USA.
Trends in Plant Science
|July 4, 2012
Summary
Systemic acquired resistance (SAR) involves multiple signaling molecules transmitted through plant vasculature. Pipecolic acid (Pip) activates SAR independently, interacting with other pathways during salicylic acid (SA) synthesis.
Area of Science:
- Plant Pathology
- Plant Physiology
- Molecular Biology
Background:
- Pathogen infection triggers systemic acquired resistance (SAR) in distal plant tissues.
- SAR activation relies on signal(s) transmitted via the vasculature from infected sites.
- Several potential long-distance SAR signaling molecules have been identified.
Purpose of the Study:
- To elucidate the complex signaling network underlying systemic acquired resistance (SAR).
- To investigate the role and interactions of identified SAR signaling molecules, including pipecolic acid (Pip).
Main Methods:
- Identification and characterization of candidate long-distance SAR signaling molecules.
- Analysis of cooperative interactions between signaling pathways.
- Investigation of independent pathways, such as that involving pipecolic acid (Pip).
Main Results:
- Identified signals include methyl salicylate (MeSA), glycerol-3-phosphate (G3P)-dependent signals, DIR1, azelaic acid (AzA), dehydroabietinal (DA), jasmonic acid (JA), and pipecolic acid (Pip).
- Some signals cooperate to activate SAR and regulate MeSA metabolism.
- Pipecolic acid (Pip) activates SAR via an independent pathway, potentially influencing salicylic acid (SA) biosynthesis.
Conclusions:
- A complex, cross-interacting web of signals mediates SAR activation.
- Pipecolic acid (Pip) represents a key, independently acting component in the SAR signaling cascade.
- Understanding these interactions is crucial for deciphering plant immune responses.
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