Fig. 8. Phenotypic effects of JAG expression under the control of the AP1 promoter. (A,E,F) Intermediate AP1::JAG lines usually form flowers with extended sepal-tubes sheathing the inner whorls. The junction between sepals and the pedicel is abnormal with sepaloid tissue running down the length of the pedicel (indicated by bracket in E). (F) SEM shows that the epidermis of the stalk of AP1::JAG flowers resembles that of wild-type sepals, shown in the inset. It differs from the wild-type pedicel epidermis shown in (G). (B,C,H) Strong AP1::JAG lines develop snake-like outgrowths in place of flowers. Only first-whorl organs initiate. (H) Amorphous tissue can sometimes be seen developing in the center of flower-like structures. (D) Weak AP1::JAG lines typically have sepals that are fused at the base (arrows). In place of petals and stamens, composite organs with petal and stamen identity form. (I) Expression of FIL in a stage 3 floral primordium of wild type. (J) In a strong AP1::JAG line, the FIL domain is expanded into the pedicel. Scale bars: 200 µm (C), 100µm (F,H) and 50 µm (G).