Figure 5.

Auxin increases extensibility of wild-type but not GFP-AtSAUR19 hypocotyls. A, Mean (±se) extension curves of auxin- or mock-treated tomato hypocotyls. Auxin-depleted hypocotyls were treated with 10 μm IAA or solvent control for 45 min and frozen. Hypocotyl segments were thawed in ice water and extensibility assessed on a TA.XTplus texture analyzer as described in “Materials and Methods.” B and C, Mean extension at a force of 15g (B) and mean tensile strength (C). Error bars depict se. Different letters above bars indicate significant (P < 0.05) differences between samples as determined by one-way ANOVA assessed by Dunnett’s test.