Floral development is the key event of plant development. One floral organ identity model (ABC model) and five genetic pathways controlling flowering time (Photoperiodic promotion pathway, Vernalization promotion pathway, Autonomous promotion pathway, GA promotion pathway, and Repression pathway) were proposed based on the studies in Arabidopsis. It was well known the GA plays important role in flowering and floral development, but roles of other hormones (e.g. auxin, cytokinin) remain unclear. S...