Simplified model of the mitochondrial role in the light stress. See main text for details. AOX, alternative oxidase; CIII, complex III; CIV, complex IV; COX, cytochrome c oxidase; Cyt c, cytrochrome c; Gly, glycine; RuBP, ribulose 1,5-bisphosphate; Ser, serine; UQ, ubiquinone.