Fig. 6: Effect of different CO2 growth environments on the relative gene expression of aquaporins in leaf and root of the two tomato genotypes.

Relative expression of genes encoding the aquaporin subfamily of plasma membrane intrinsic proteins (PIPs) in leaf (a) and root (b) of wild-type tomato “Ailsa Craig” (WT) and its representative ABA-deficient mutant (flacca) grown under ambient (400 ppm, a[CO2]) and elevated (800 ppm, e[CO2]) CO2 environments. Different letters on the top of the columns for each PIP gene indicate significant difference between the treatments by Tukey’s test at P < 0.05. Error bars indicate standard error of the means (SE) (n = 4)