Fig. 7. scd1::T-DNA mutants showed defects in leaf trichome and epidermal pavement cell expansion. (A) wild type and (B) scd1-2 cotyledon epidermal cells stained with propidium iodide. The white arrowhead indicates a potential recently divided guard mother cell. (C) Wild-type and (D-G) scd1-2 leaf trichomes on emerging leaves. (E) An enlarged view of expanding unbranched scd1-2 trichome initials. (F,G) Older leaves of scd1-2 seedlings showing mechanically unstable trichomes and small gaps between pavement cells (arrowheads). Cell debris is often observed in craters surrounded by the subtending socket cells of broken trichomes. (H,I) Transmission electron micrographs of cells from very young leaves; (H) a wild-type telophase cell and (I) a cytokinesis-defective scd1-2 cell. C, chloroplast; CP, cell plate; CWS, cell wall stub; PCW, parental cell wall; G, Golgi; M, mitochondrion; N, nucleus; V, secretory vesicles. Scale bars: 10 µm (A,B); 50 µm (C-G); 1 µm (H,I).