Fig. 5. UFO-SRDX represses endogenous LFY activity. (A,H) WT (L. er) plants. (B-G,I) 35S::UFO-SRDX plants. (A) A wild-type flower. (B) The first arising flower-like structure in a transgenic 35S::UFO-SRDX line. The structure is subtended by a bract and consists of leafy organs, sepal-like organs and carpelloid sepals arranged in a spiral. (C) The fourth structure produced on the primary inflorescence. Organs are arranged in a spiral pattern. Occasionally, such flowers produce petals with reduced number and size. The flowers are infertile. (D) A later-arising flower with floral organs arranged in a whorl and subtended by bracts (arrow). The bracts are spirally arranged and show internode elongation. (E) A transgenic primary inflorescence in which the apex terminates with fused carpelloid sepal-like organs. Even apical flowers are subtended by bracts. (F) A representative 35S::UFO-SRDX flower from the line that resembles ufo-2. Like ufo-2 flowers, petals and stamens are absent or reduced in number and size or are filamentous. Carpelloid sepals and mosaic organs are often also observed. (G) A lateral structure from one of the most severe transgenic lines. No floral organs are produced; rather, only leaf-like organs arise in a spiral phyllotaxy with internodes elongated resembling ap1 lfy double mutants. (H) A wild-type inflorescence subtended by cauline leaves (arrow). (I) An inflorescence from a 35S::UFO-SRDX plant. Flowers are subtended by prominent bracts (arrow) or stipules (arrowhead). Only inflorescences but not flowers are subtended by cauline leaves in wild type (H).