3.5 | Rubisco activase
There were no clear indications of photosynthesis being limited by Rubisco activase in either control or treatment plants. The temperature trends of observed and modeled initial slopes appeared to diverge when leaf temperatures exceeded 42°C (Fig. S4), but only in control plants transferred to treatment conditions was there a clear separation of the curves and their 95% confidence intervals within the measured temperature range. Treatment plants transferred to control conditions experienced moderate Rubisco activase limitation at most temperatures (Fig. S4).