Fig. 2. SEM analysis of wild-type and jag mutant petals. (A,D) Distal, (B,E) middle and (C,F) proximal regions of abaxial epidermal surface. (A-C) Wild-type with (A) round epidermal cells (arrow), (B) a mixture of round (arrow) and elongated cells (arrowhead) and (C) elongated cobblestone-shaped cells (D-F) jag-2 mutant with (D) elongated cobblestone-shaped cells, (E) elongated cells (note the fewer number of cells along proximal-distal axis than in wild type) and (F) elongated cobblestone-shaped cells. (G,H,I) The distal regions of the abaxial petal epidermis in wild-type, jag-3 and jag-2, respectively, showing the allelic differences in phenotypic strength on cell shape. (H) The jag-3 petal has both elongated (arrowhead) and round cells (arrow). (I) The jag-2 petal only has elongated cobblestone-shaped cells. Also note a striking difference in cell numbers between wild type (G) and jag-2 (I). For all panels distal is top and proximal is bottom. Scale bars: 20 µm, A-F and G-I.