Figure 2. Root growth assay in presence of the ethylene biosynthesis inhibitor, 2-aminoisobutyric acid (AIB). Wild-type control plants as well as YUC8ox and YUC9ox plants were grown on vertical plates containing varying amounts of AIB. Depicted is the relative root growth inhibition in percent of untreated control plants of each genotype. Means are given with their SE (n = 10–12 seedlings).