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Mean normalized leaf expansion rate of (A) PI 416937 (B) PI 471938 and (C) Hutcheson during the VPD treatments following the initial two days of measurement in the low VPD chamber. The results were plotted against days since the initiation of the treatments in the high VPD chamber (open circles) and in the low VPD chamber (closed circles). The standard error bars are plotted for the mean on each day.
