Summary of HRAC herbicide groups involving light activation of ROS. DXS, deoxy-d-xylulose phosphate synthase; HPPD, hydroxyphenylpyruvate dioxygenase; HRAC, Herbicide Resistance Action Committee; HST, homogentisate solanesyl transferase; LC, lycopene synthase; PDS, phytoene desaturase; PPO, protoporphyrinogen oxidase; PSI, photosystem I; PSII, photosystem II; ROS, reactive oxygen species; SDS, solanesyl diphosphate synthase.