MADS-box genes family plays a key role in the molecular regulation of floral development, and most of them in plants belong to the typeII class, that is, the gene sequence is composed of M, I, K and C domains.

• MADS-box基因在植物花发育的分子遗传调控过程中起着关键性的作用，它们多数是由M、I、K和C四个区域构成的，很少一些MADS-box基因在M区上游还具有一段富含碱性氨基酸的N末端区域。