Figure 3.

Microtubule orientation in cortical cells as a function of distance from the apex of well-watered (ww) and water-stressed (ws) roots. A, Mean microtubule angle measured for cells localized in median-longitudinal sections. B, The sds of the above distributions. At each position, 20 microtubules were sampled from two cells, and the data presented were pooled from measurements of 5 to 10 roots (100–200 microtubules measured per position).