The effect of 6 h cytochalasin-B (CB) treatment on cortical microtubules of wild-type root tips.

<p>Single CLSM section (a) or maximum projections (b-d). Cortical microtubules are mainly transverse in the meristematic (a), transition (b) and early elongation (arrowheads in c) zone. In the longer epidermal cells of the elongation zone (arrows in c and d), shootward, microtubules are randomly oriented. Scale bars, 20 μm.