abscission layer

The abscission layer is a distinct layer of cells within a plant's abscission zone. This layer is crucial for the process of abscission, which is the shedding of plant parts like leaves, fruits, or flowers.12

As days shorten and temperatures drop, plant hormones are activated, initiating abscission. The abscission layer forms between the leaf stalk and the twig, effectively separating the leaf from the plant without causing an open wound. This process is influenced by hormones such as auxins, ethylene, and abscisic acid, which play roles in regulating senescence and enzyme synthesis needed for cell wall breakdown. Shedding leaves is a protective mechanism for deciduous plants, preventing damage from freezing and wind, and allowing for nutrient recycling.34