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Among the chemical compounds already described are the flavonoids, clerodanes and labdanes, auranas, triterpenoids, germaceno, cumaric acids, sesquiterpenes phenylpropanoids (Cuzzi, Link, Vilani, Sartori, & Onofre, 2012).
In this respect, it appears that the incorporation into the cell wall of the derivatives of hydroxycinnamic acid (HCA), mainly cumaric, ferulic, and their conjugates, induced by pathogens, should strengthen rigidity and diminish digestibility of the cell wall by the degrading enzymes of the pathogen (Nicholson & Hammerschmidt, 1992).