A Novel Sulfated Glycoprotein Elicitor Extracted from the Moroccan Green Seaweed Codium decorticatum Induces Natural Defenses in Tomato

Sulfated glycoproteins extracted for the first time from Moroccan green seaweed Codium decorticatum were investigated their ability to induce a natural defense metabolism in roots and upper leaves of tomato seedlings. The crude (AGB) purified fractions (AGP) characterized chemically (Colorimetric assays) structurally (SEC-MALS, GC-EI/MS, ATR-FTIR). elicitor aqueous solutions (1 g/L) applied by foliar spray syringe infiltration into internodal middle 45-day-old Phenylalanine ammonia-lyase (PAL) activity, polyphenols, lignin contents measured after 0 h, 12, 24, 48, 72 h treatment. AGB AGP extracts contained 37.67% 48.38% total carbohydrates, respectively, mainly composed galactose, glucose, arabinose, minor amount xylose rhamnose. They an important molecular weight (Mw) > 2000 × 103 g·mol−1 high degree sulfation protein (12–23% (w/w)), indicating that polysaccharides could be arabinogalactan-rich present cell wall C. decorticatum. Both exhibited effect inducing PAL accumulation phenolic compounds These responses systemic both methods used (injection spray) mobilized throughout tissues are not directly treated (roots and/or leaves). Regarding activities, presented globally similar patterns, which revealed importance stimulation plant immunity. results suggest new application sulfated glycoprotein isolated agriculture as inducers defenses plants.