Altered Light Response of Xanthophyll Cycle in Herbicide-Resistant Erigeron Canadensis Biotypes in the Presence of Paraquat

The excess of the absorbed energy must be sufficiently dissipated to maintain the integrity of the photosynthetic apparatus. One of these protective energy dissipating mechanisms the xanthophyll epoxidation cycle working on the lumenal side of grana thylakoids recently has been thoroughly investigated in many species and under a wide range of environmental and physiological conditions [1,2,3,4].