Figure 6

Feedback control system to mimic the photosynthetic light acclimation mechanism. Two PS-lights represent high energy input (PSII-light) and low energy input (PSI-light), respectively. e^- (k) denotes the difference between the oxidized state of PQ pool and the homeostatic state. e⁺ (k) denotes the difference between the reduced state of PQ pool and the homeostatic state. Chloroplast signals inform the transcription factors how to cope with changes in the surrounding environment via the signal transduction pathway in the cytosol. The transcription factors act as mode switch between different regulating gene sets to display different modes which counteract any change in light input.