Fig. 3. Floral phenotype of ifa1 mutants. (A) Normal pistil. Two of the carpels fuse and elongate to form the silk. (B) The ovule primordium is exposed inside the fused carpels. (C) ifa1-r pistil. A nucellar-like proliferative tissue arises from the floral apex, vestiges of the carpel wall and rudimentary silk can be seen. (D) Occasionally, multiple ovule-like protrusions form at the center of the ifa1-r pistil. (E) ifa1-r spikelet showing ectopic inflorescence from both florets. This phenotype occurs at a low frequency. (F) Normal male spikelet. The stamens of the upper floret are visible, the stamens of the lower floret remain enclosed by the lemma and palea. (G) ifa1-r male floret. Nucellar-like proliferative tissue (arrow) is present inside the stamen whorl. (H) ifa1-r male floret with extra stamens at the center of the stamen whorl. (I) The dissected floret from H. Inside the stamen whorl are leaf-like organs and more stamens. si, silk; op, ovule primordium; s, stamen; lf, lower floret.
