Mean rates of gas exchange during Experiment 2 in 2017.

<p>Photosynthesis (upper panel), stomatal conductance (middle panel) and instantaneous water use efficiency (the ratio of photosynthesis to stomatal conductance; lower panel) are shown. Open circles represent planted cultivars and filled circles represent wildtype trees, combined among sites. Lines represent model predictions for planted cultivars (dashed line) and wildtype trees (solid line), after accounting for effects of tree diameter and site.