Abstract
Flowers play roles in transferring the genetic information to the next generation. Androecium and gynoecium are involved in the reproduction, while calyx protects the inner floral organs from outer environment, and corolla attracts pollinators such as insects and birds. For this role the corolla has evolved to be the most variable plant organ with their shape, color, and fragrance. Genetic mechanism of floral organ development has been clarified with the use of Arabidopsis thaliana, a model plant for the molecular research. Here I introduce the molecular system of the petal development, with including the recent findings.
