Inner structure of the wild-type and mnd mutants at 1 week (A–D) and 2 weeks (E–H) after germination. (A, E) Akashinriki, (B, F) mnd8OUM165, (C, G) mnd4OUM169, and (D, H) mnd1OUX051. xL indicates the xth leaf and Px indicates the order of leaf emergence from the shoot apical meristem. col, coleoptile. Bars: 200 μm.