Fig. 2. Modelling the diurnal impacts of slow changes in Rubisco activity at 30 °C.

a, Light regime for a chloroplast in a second-layer legume canopy¹⁴. b, Mid-day segment of diurnal time series for the cowpea line IT86D-1010. Lags relative to tracking of a steady-state PPFD response are shown for modelling based on Rubisco activity (τ_d,S, τ_a,S) compared with gas exchange measurements (τ_d,V, τ_a,V); note the impact of shade duration on differences between the models. c, Cumulative assimilation during the diurnal period for the scenarios in b, alongside models simulating the effect of slower deactivation (τ_d,V, τ_a,S) and slower activation (τ_d,S, τ_a,V) of Rubisco.