Abstract
Systemic acquired resistance (SAR) is an inducible defense mechanism in plants that is activated throughout the foliage in response to a prior localized exposure to a foliar pathogen. The enhanced resistance status resulting from the activation of SAR can be maintained over a couple of generations. Critical to SAR is effective long-distance communication by the pathogen-inoculated organ with rest of the foliage, which requires the lipid transfer protein DIR1. The emerging consensus is that long-distance signaling in SAR involves networking between multiple vascular-translocated signaling molecules. The proposed salicylic acid receptor NPR1 is important for downstream signaling that involves defense priming. Chromatin remodeling is projected as an important mechanism in priming and memory associated with SAR.
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