Fig. 1

SIM imaging of cortical microtubules in Col-0, ktn1-2 and mpk4. a, b Cortical microtubules of Col-0 meristematic root epidermal cells are well organized in parallel cortical arrays (a) and are predominantly transverse to slightly oblique with respect to the cell axis (b). In meristematic root epidermal cells of ktn1-2 mutant cortical microtubules exhibit random orientations (c) which is reflected to their broad angular distribution (d). Similarly, cortical microtubules of mpk4 root epidermal cells show mixed orientations (e) and broad angular distribution (f). Bars in a, c, e = 10 μm