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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).
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