Figure 1.

Auxin dose response of MAX3, MAX4, and IAA1 expression in wild-type (WT) and axr1-3 basal cauline internodes. IAA was applied in a lanolin ring around the primary bolt of 5-week-old plants 15 mm above the base, and the cauline tissue below the application site was collected 3 h post application. Expression is shown relative to wild-type controls for each gene; data are means of two biological pools of six plants ± se. Asterisks indicate significant differences between axr1 and the wild type.