Figure 3.

Polar auxin (³H-IAA) transport in wild-type and rum1 roots and coleoptiles. White columns indicate polar auxin transport (root, transport toward the root tip; coleoptile, transport away from the tip of the coleoptile); black columns represent the control transport experiments. Polar auxin transport in the primary root of the mutant rum1 is reduced by 83% compared to polar auxin transport in wild-type primary roots. In the coleoptile, no statistically significant differences in transport were detected. **, Indicates a significant difference in the t test (unknown and unequal variances of the two populations) at a level α of 1%; error bars indicate standard error of the mean.