Fig. 3.

Effects of sodium azide (NaN₃) on root hydraulic conductivity and effects of root barrier mutations on residual water transport. Measurements were performed in a collection of 19 to 21 d‐old Arabidopsis Col‐0 and 11 Casparian strips (CS) and/or suberin mutants (means ± SE, n = 15–20, n = 3). The aquaporin‐dependent pathway (colored bar) was derived from the substraction of xylem sap flow before (full bar) and after 40 min (residual‐Lp_r, gray bars) of a NaN₃ treatment. Uppercase and lowercase letters inside the bars indicate significant differences. Data were analyzed using one‐way ANOVA and Tukey’s test at α = 0.05.