Hydrogen Peroxide Can Enhance the Synthesis of Bioactive Compounds in Harvested Broccoli Florets

Hydrogen peroxide (H 2 O ) is a reactive oxygen species (ROS) which participates in the signal transduction responses of plants toward biotic and abiotic stresses. Therefore, objective this study was to link exposure low doses H improvement phytochemical composition broccoli florets, particular content glucosinolates (GLS), hydroxy-cinnamates (HCA) without affecting quality parameters vegetable. A dose 1.25 mM applied for 180 min effective (hormetic) maintaining color also compared with higher 5.0 min. The intensity treatments related respiration rate, monitored 21 d at 4◦C along weight loss. initial rate florets exposed both significantly ( p < 0.0001) relative controls resulted loss treated hormetic dose. antioxidant capacity measured indirectly as Oxygen Radical Absorbance Capacity (ORAC) ascorbic acid (AA), decreased doses. concentration glucobrassicins, aliphatic GLS, HCA consistently two doses, non-exposed florets. enhancement these compounds accompanied by over expression, immediately (6 h) after treatments, tryptophan N-hydroxylase (CYP79B3), dihomomethionine (CYP79F1), phenylalanine ammonia-lyase (PAL) genes. Overall, tested positively influenced augmentation indole-type well