Fig. 1

Comparison of microtubule integrity between the wild-type and than/+. Effects of oryzalin on 4-5-d-old wild-type (a, b) and than/+ (c, d) roots. Seedlings were treated for 4 h with 400 nM oryzalin. In the meristematic zone, cell divisions are affected (a, c arrows). Cortical microtubules in transition and fast elongation zone cells of than/+ appear more integral than those of the wild-type (d; cf. b). In all the Figures the insets show immunostained microtubules at higher magnification. Scale bars: 20 μm