The answer is yes, PAL(Phenylalanine ammonia-lyase) is an enzyme that catalyzes the key reactions of deamination of the poly-alanine. Polyalanine deaminates and forms the trans-cinnamic acid which is the precursor of lignin and flavonoids.
lignin and flavonoids have a major role in defense stimuli under biotic and abiotic stresses.
Phenylalanine ammonia-lyase (PAL) is the key enzyme in the phenol synthesis pathway and the accumulation of phenols that act as phytoalexins is considered the primary inducible response in plants against several biotic and abiotic stresses.