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Table 1 . Leaf water isotope parameters for Zea mays wildtype and Zmasft double mutants (aliphatic suberin feruloyl transferase), grown under 300 or 1200 photosynthetic active photon flux density (PAR; μmol photons m-2 s-1) and either 50 or 80 % relative humidity (RH). Stomatal measurements were on plants grown at 80 % RH. Results of the main effects of a three-way ANOVA are included, except the stomatal traits. Stomatal traits were analyzed using a two-way ANOVA because they were only measured in plants grown under 80 % RH. Significance was shown as ns, *, **, and *** for not significant, P < 0.05, P < 0.01, and P < 0.001, respectively. The only interactions where P < 0.05 for at least one trait were RH x PAR and Genotype x PAR (Table S1).