2021. Phenylalanine ammonia lyase (PAL) activity in genotypes of Opuntia spp. against artificial infestation of Dactylopius opuntiae submitted to biotic and abiotic resistance inducers. Research, Society and Development. 10, 5 (May 2021), e41610515106. DOI:https://doi.org/10.33448/rsd-v10i5.15106.