Figure 1.

Model of integrative photoprotection of the electron transfer chain upon changing intensity of white light. Experiments with three ‘regulatory mutants of thylakoid function’, stn7, pgr5 and npq4, have enabled the formulation of the model and are included in the model, in addition to WT. (a) The electron transfer chain under constant low and moderate light intensity in WT and different mutants. (b) The situation upon sudden increase in light intensity and (c) upon prolonged high light stress with PSII photoinhibition. For details, see the text.