Figure 6.

Auxin responses in wild-type and drr1 seedling roots. A, Primary root growth in 12-d-old primary roots of wild-type (Col-0 and Ws), axr2-1 and aux1-7 auxin-resistant mutants, and drr1 Arabidopsis mutants grown on medium supplied with the solvent only or with varied IAA concentrations. B, Morphology of root tips of wild-type and mutant lines exposed to IAA. Seedlings were photographed at 7 d after germination using a digital camera connected to a dissecting microscope. Values shown in A are means ± sd (n = 30). The experiment was repeated twice with similar results. [See online article for color version of this figure.]