Fig. 6.

Key model predictions related to the structure of the electron transport system. These simulations illustrate the effects of variation in parameters that control electron transport under limiting light intensities: the absorptance to PAR (Case 1), the maximum activity of Cyt ${\text{b}}_6\text{f}$ (Case 2), the efficiency of coupling between electron transport and ATP production (Case 3), and the chloroplast ${\text{CO}}_2$ (Case 4). Results are plotted for the potential rates of LEF and CEF1 together, the potential rate of CEF1 alone, the potential rate of gross ${\text{CO}}_2$ assimilation, and the potential absorbed quantum yield for ${\text{CO}}_2$ assimilation. Note that the rates are described as ‘potential’ because they all correspond to the Cyt ${\text{b}}_6\text{f}$-limited state. The input parameters are given in Table 2, and other details as described in ‘Limits of electron transport (Cases 1–4)’