The role of Cytochrome $$\text {b}_{6}\text {f}$$ b 6 f in the control of steady-state photosynthesis: a conceptual and quantitative model

摘要: Here, we present a conceptual and quantitative model to describe the role of Cytochrome $$\hbox {b}_{6}\hbox {f}$$ complex in controlling steady-state electron transport {C}_{3}$$ leaves. The is based on new experimental methods diagnose maximum activity Cyt vivo, identify conditions under which photosynthetic control active or relaxed. With these approaches, demonstrate that controls trade-off between speed efficiency limiting light, functions as metabolic switch transfers carbon metabolism saturating light. We also evidence onset occurs within milliseconds exposure much more quickly than induction non-photochemical quenching. propose primary means photoprotection manage excitation pressure, whereas quenching balance. use findings extend Farquhar et al. (Planta 149:78–90, 1980) photosynthesis include mechanistic description system. This framework relates light captured by PS I II energy mass fluxes linking photoacts with , ATP synthase, Rubisco. It enables interpretation pulse-amplitude modulated fluorometry gas-exchange measurements, providing basis for analyzing how system coordinates supply Fd, NADPH, dynamic demands metabolism, efficient achieved designed support forward well inverse applications. can either be used stand-alone mode at leaf-level coupled other models resolve finer-scale coarser-scale phenomena.