Figure 2.

The xrn4 mutants exhibit extreme auxin-dependent epinasty of cotyledons. The incidence of the auxin-hypersensitive response in populations of Col-0 (open bars), ein3-1 (light grey bars), ein5-7 (dark-grey bars), and xrn4-3 mutants (dark bars). Seedlings (n > 17 for each condition and genotype) were grown on media containing the concentration of N-1-Naphthylphthalamic Acid (NPA) indicated and harvested four days after germination. The p values (two-tailed Fisher’s exact test) for significant differences towards each other are indicated.