Fig. 1. Floral reversion in ag-1 mutant backgrounds. (A) Wild-type flower with sepals (se), petals (pe), stamens (st) and carpels (ca) forming the central gynoecium. (B) LFY:VP16, intermediate phenotype. The outer whorl is occupied by carpelloid organs. Organs in whorl 2 are missing or replaced by stamens. (C) LFY:VP16, strong phenotype. The number of floral organs is reduced further. All of them are carpelloid, and no whorled structure is apparent. (D) ag-1. Stamens in whorl 3 are replaced by petals, and the central gynoecium by an internal flower that repeats the pattern of the primary flower. (E-G) LFY:VP16 ag-1, strong phenotype. Young flowers are similar to those of ag mutants and include petaloid sepals (E). In older flowers, a new inflorescence (inf) emerges from the center (F,G). (H) lfy-6/+ ag-1 flower from a plant grown in short days. After a few whorls of floral organs had formed, the flower reverted to an inflorescence. All plants were grown in long days except (H). Scale bars 1 mm.