Defense to plant pathogens is activated by molecules originating from the host and the pathogen itself, such as pathogen-associated molecular patterns (PAMPs) and secondary metabolites. This allows for the establishment of a local defense response, as well as for the generation of a secondary signal(s) involved in the activation of a systemic defense response, the so-called systemic acquired resistance (SAR). Early detection of the pathogen triggers a cascade of events, often leading to limiting it to the initial site of infection via programmed cell death . Several endogenous molecules involved in the activation of the defense response have been described, such as salicylic acid, jasmonate, and cell wall fragments from the host and pathogen. Additionally, different abiotic factors activate broad-spectrum resistance such as heat, cold and other physical factors, suggesting that at some points these pathways converge.
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Citation: Salgado-SiclÃ¡n ML, Rojas-MartÃnez R, Zavaleta-MejÃa E, Ochoa-MartÃnez D, BurgueÃ±o-Ferreira J, et al. (2012) Differential Accumulation of Defense-Related Transcripts by Inducers of Resistance in Arabidopsis. J Plant Pathol Microb 3:137.
Last date updated on July, 2014