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Structure, Development & Function of Periderm

Periderm is a protective layer that replaces the epidermis in various plant parts, primarily stems and roots. It consists of three layers: phelloderm, phellogen (cork cambium), and phellem, each serving distinct roles in structure and development. The main functions of periderm include protection against environmental stressors and facilitating gaseous exchange through lenticels.

Science◦
Structure, Development & Function of Periderm Presented By: Uzma Batool(34) Subject: Plant Anatomy Life Sciences, IUB.
Periderm: • A group of secondary tissues forming a protective layer which replaces the epidermis of many plant stems, roots, and other parts. • Although periderm may develop in leaves and fruits, its main function is to protects stems and roots.
 Structure & Development: The periderm consists of three different layers: 1. Phelloderm 2. Phellogen (cork cambium) 3. Phellem (cork)
1. Phelloderm: • It consists of cells that resemble parenchyma cells in the cortex. • The phelloderm cells are phellogen derivatives formed inward. • Phelloderm consists of living cells with photosynthesizing chloroplasts and cellulosic walls. • The number of phelloderm layers varies with species, season, and age of the periderm.
2. Phellogen: • Secondary meristem and may form at the same time as vascular cambium. • Single or multi layered. • The function is to produce the cork, a tough protective material. • Synonym is Cork cambium.
3. Phellem: • The phellem cells are phellogen derivatives formed outward. • Cells are arranged in tiers with almost no intercellular spaces except in the lenticel regions. • After completion of their differentiation, the phellem cells die and their protoplasts disintegrate.
 Function: Its main function is to protect the underlying tissues from: • Desiccation • Freezing • Heat injury • Mechanical destruction • Disease
Loss of epidermis. Bounding tissue restricting the pathogen & insects. Allowing gaseous exchange through lenticels.