The hormones secreted by body influence anatomical changes. In the future area of abscission, a special narrow abscission zone develops. It consists of a upper lignified and suberised protective layer. The separation layer consists of unthickened cells where the hydrolysing enzymes develop. Pectinases are secreted out to dissolve middle lamellae. Cellulases bring about hydrolysis of cell walls. Due to this, the separation layer becomes soft and weak. This leads to shedding of leaves from plants.