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Elicitors of plant defence responses-SAR- Several signal molecules or “elicitors” from pathogens orfrom hosts can trigger defence responses in plants.- Fungal cell wall elicitors have been well characterizedand include oligosaccharides, glycoproteins, peptidesand lipids.(E.g., β-1,3–1,6 glucans, xyloglucans, oligogalacturonides; and chitinderivedoligomers like Chitosans)- Plant-based elicitors(E.g., oligogalacturonic acids (OGA)- Synthetic compounds(E.g., Acetylsalicylic acid (aspirin), benzo(1,2,3)thiadiazole-7-carbothioic acid S-methyl ester (BTH)