Shoot apical meristem has two principal functions : the creation of self- and lateral buds organs , such as leaves and stems fillet . These functions are closely associated with zones cytohistologicznymi meristem . The central zone , which is engaged in samoodtwarzanie meristem , in Arabidopsis thaliana is characterized by the expression of the gene family clavata and WUSCHEL . Create organ primordia occurs in the lateral peripheral zone . Located below the central zone meristem Pole involved in the formation of the stem.