*4.5. Elicitation Test*

Roots of three-month-old date palm plants (greenhouse model) were soaked in fucoidan solutions (FSF and BBF) at a concentration of 0.5 g/<sup>L</sup> and pH 6.5 over 4 days. Fucoidans-treated roots were compared to distilled water-treated roots as a control treatment. After 12 h and then every 24 h, biochemical assays of phenylalanine ammonialyase (PAL) activity, phenolic compounds and lignin content in treated roots were performed. Data were reported as the means values of 3 replicates, each replicate containing 3 plants.
