This project explores a new genetic pathway that determines the arrangement of sepals and petals within flowers. We will focus on a regulatory gene within this pathway that suppresses growth between sepals, keeping them separate. The pathway also regulates petal initiation in combination with the plant hormone auxin. The mechanism of growth suppression and petal initiation will be uncovered by identifying the signalling partners and downstream targets of the gene. Thus our research will uncover a new genetic mechanism by which flower design is controlled.