Cell numbers are reduced in aerial organs of <i>tud1-2</i>.

<p>(A) Aerial parts of three-week old wild type (WT) (upper-left) and <i>tud1-2</i> (upper-right). Schematic illustration of the third leaf sheaths is shown in middle bottom. Central parts of the leaf sheaths were cut off and the lengths of motor cells between files of stomata were measured. (B) Panicles and internodes of wild type (WT) and <i>tud1-2</i>. PA, panicle; BRI, basic rachis internode; IN, internode. Internode I, II and III are the first, second and third internodes, respectively. Bar: 10 cm. (C) Lemma and palea of WT and <i>tud1-2</i>. LM: Lemma; PL: Palea. Bar: 2 mm. (D,E) Longitudinal sections of the third leaf sheath from one-month old seedlings of wild type (WT) (D) and <i>tud1-2</i> (E). Bar: 200 µm. (F,G) Longitudinal sections of the third internode from one-month old seedlings of wild type (WT) (F) and <i>tud1-2</i> (G). Bar: 200 µm. (H,I) Inner epidermal cells of lemma from one-month old seedlings of wild type (WT) (H) and <i>tud1-2</i>(I) observed by SEM. Bar: 100 µm.