Abstract
The flower of spirally arranged numerous stamens and carpels is found in polycarpicae within ancestral taxa. Such flower is considered a primitive flower by the euanthium theory. In contrast, the flower of core eudicots mostly have fixed number of organs arranged in whorls. Thus, the organization of flower is differ between core eudicots and polycarpicae. Phylogenetic analyses indicates that gene duplications followed by functionalizations might have occurred in the AP1/FUL, AP3 and AG gene lineages at the base of the core eudicots. It is suggest that mechanism of flower development and gene function may differ between core eudicots and polycarpicae. Here, FUL-like, PI and AG-like gene of R.screlatus, belong the basal eudicots and have the flower of polycarpicae, was isolated and examine gene expression patterns. To consider a role of FUL-like genes in floral development in polycarpicae, we frame a hypothesis based on our results and BC model.
