Fig. 8. Postgermination phenotype of ise1 mutant. (A) Wild-type (wt) and sibling ise1 seedlings 18 days postgermination on culture plates. At this stage the wild-type seedling has 4 true leaves with trichomes as well as an elongated primary root, but the mutant has only a pair of macroscopic cotyledons and a very short primary root. (B) Scanning electron micrograph of the root epidermis of wild-type 2 days postgermination shows cell files with root hairs (red circles) and without root hairs (yellow X). In the ise1 root epidermis (C), however, all cell files produce root hairs (red circles) indicating a homogenization of cell fate. Scale bars, 50 µm.
