Figure 4. Basipetal indole-3-acetic acid (IAA) transport is increased with 1-aminocyclopropane-1-carboxylic acid (ACC) treatment and in eto1-1 seedlings.

Five-day-old Col or eto1-1 seedlings were treated with 1 μm ACC, 10 μm silver nitrate or both, and basipetal IAA transport was quantified after 24 h of treatment. The average and SE of 30 seedlings are reported, and statistical analysis was performed using the Student’s t-test, with all values being significant with P < 0.0001, with the following comparisons within genotypes: a, with and without ACC; b, with and without silver nitrate; c, with ACC and with and without silver nitrate, and between genotypes; d, untreated Col versus silver nitrate treated eto1; and e, untreated Col versus eto1-1.