Fig. 2.

BRs promote cell expansion and cell number in the root meristem. (A) Direct measurement of the length of the different root zones. (B) Quantification of cortical cell number present in each zone and the whole meristem. (C) Calculation of the average cortex cell length for each meristematic zone. Seven-day-old seedlings were analyzed. Results are presented as mean±s.e.m. Note the dramatic drop in the number of cells and in their size in the basal meristem of bri1, relative to the apical meristem, when compared with wild type.