Figure 2. The nek4, nek5 and nek6/ibo1 mutants are hypersensitive to microtubule inhibitors. (A) Morphology of the wild type (WT) and nek mutant seedlings grown for 8 d on the MS agar medium in the absence (Mock) or presence of 3 µM propyzamide (+PPM) or 1 µM taxol (+TAX). Bar = 10 mm. (B) Root length of the wild type (WT) and nek mutants grown for 10 d in the absence (Mock) or presence of 3 µM propyzamide (PPM) or 1 µM taxol (TAX). (C) Root slanting angles (θ) of 8-d-old seedlings of the wild type (WT) and nek mutants grown as described above. Rightward- and leftward-slanting angles (viewed from the shoot apex) are expressed as positive and negative values, respectively. In (B) and (C), values are means ± SE (n ≥ 22). Asterisks indicate significant difference from the wild type (Student t-test, p < 0.02).