FIGURE 4.

Light-induced and steady-state net photosynthesis (A_n) for the null and T-Oa-19 transgenic line grown under 45°C daytime maximum temperatures. (A) After 30-min of low light (∼30 μmol m^-2 s^-1), high light (1500 μmol m^-2 s^-1) was applied and A_n recorded every 10 s. Dashed lines represent the SEM. (B) The log transformed mean and SEM of final A_n minus A_n at each time point (A_f–A) was plotted against time and a linear regression fit in the range 1–10 min. The regression slope represents the Rubisco activation rate constant (K_a) with the mean value given and 95% confidence interval presented in brackets. (C) A boxplot of the final steady-state A_n after 40 min of high light. All analyses are based on seven biological replicates.