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Proposed model explaining the combined effect of wounding and UVB radiation stresses on the accumulation of phenolic compounds and ascorbic acid in prickly pear. Abbreviations: L-galactono-γ-lactone dehydrogenase (GalLDH); UV RESISTANCE LOCUS 8 photoreceptor (UVR8); CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1); REPRESSOR OF UV-B PHOTOMORPHOGENESIS 1 and 2 (RUP1/RUP2); transcription factor ELONGATED HYPOCOTYL5 (HY5); reactive oxygen species (ROS); phenylalanine ammonia-lyase (PAL).
