Fig. 7. CUC1 acts as a growth antagonist. (A-C) SEM images of the (abaxial) sepal epidermis of wild-type Ler (A), mir164abc triple-mutant (B), and 35S::CUC1^m-GFP transgenic plants (C). The sepals of mir164abc mutants were typically narrower than, but otherwise indistinguishable from, wild-type sepals (compare B with A). (D-G) The bar chart in D depicts the average number of epidermal sepal cells touching a 100 µm by 100 µm square projected onto the central abaxial region of sepals of wild-type (G) and 35S::CUC1^m-GFP transgenic plants (F). The average cell number per 0.01mm² was 31.8±8.8 (s.d., n_tot=10) for 35S::CUC1^m-GFP transgenic plants and 28.1±2.5 (s.d., n_tot=11) for Ler wild-type sepals. The bar chart in E depicts the average sepal length of 35S::CUC1^m-GFP and wild-type plants. The average sepal length was 360±101 µm (s.d., n_tot=10) for 35S::CUC1^m-GFP plants and 1529±89 µm (s.d., n_tot=9) for Ler wild-type plants. Scale bars: 100 µm.