plerome

The "plerome" is a term in plant anatomy that refers to the central core of primary meristematic tissue. According to the histogen theory, this core gives rise to the stele, which is the central vascular cylinder in plants. In a root tip, the plerome specifically denotes the stelar region. Meristematic tissue, like the plerome, is composed of actively dividing cells responsible for plant growth. These primary meristems, including the plerome (which develops into the stele), the protoderm (forming the epidermis), and the ground meristem (forming ground tissues), originate from the apical meristem.123456