Flos Carthami, dried flower petals of safflower Carthamus tinctorius L., is an important crude drug in traditional Chinese medicine for promoting blood circulation and removing obstruction in the channels. The main chemical composition hydroxysafflor yellow A (HSYA) is the main active component. The quality of Flos Carthami was influenced by the content of the HSYA directely. It is important to find out the functional genes to regular pattern of heredity about the safflower quality. As a result, identificat...