The QC is disorganized in postembryonic roots of atdfb. A, Median confocal image of a 5-d-old propidium iodide-stained wild-type root clearly shows a well-organized QC (arrows). B, In atdfb-1 roots, cells in the region corresponding to the QC have a disorganized pattern (arrows). C to F, In mature embryos (C and D) and roots from 2-d-old seedlings (E and F), QC organization in the wild type (C and E) appears similar to atdfb-1 (D and F). Bars = 10 μm.