Fig. 5. SEM analysis of the ontogeny of wild-type (A,C,E) and inco floral meristems (B,D,F). The flowers shown in B are at late stage 2 and at early stage 3 in A, at stage 4 in C,D and at stage 5 in E-H [stages from Carpenter et al. (Carpenter et al., 1995)]. In def (G), second whorl organs are homeotically transformed to sepals and are smaller than in the wild type (see Fig. 6A,B), therefore size and position of sepals is less affected in def inco flowers (H). Prophylls are shown by an asterisk and numbers indicate the sequential order of appearance of sepal primordia. Scale bars: 50 µm in A,B; 100 µm in C-H.