[Biology Class Notes] on Epidermis – Plants Tissue Pdf

The epidermis, ground tissue, and vascular tissue are three broad groups of plant tissues.

The epidermis is the layer of cells on the outside of plant shoots that protects them from moisture loss and physical damage. It’s made up of a lot of different types of cells.

The epidermis of most plants has dorsoventral anatomy, with the top being adaxial and the lower being abaxial, and their architecture differs slightly, as well as their function. 

The secondary covering known as periderm is produced by some of the woody stems and other sections of the potato tubers, and it replaces the epidermis as the protective covering.

The epidermis is the main part of the skin on the leaves, as well as the stems, roots, flowers, fruits, and seeds.

Epidermal cells are usually clear. They have fewer chloroplasts or don’t have any at all, except for the guard cells.

There are four layers to the epidermis:

Pavement cells, guard cells, and their secondary cells that surround the stomata and trichomes, commonly known as leaf hairs, make up the plant epidermis.

Trichomes are controlled by two primary trichome specificity genes and develop at a separate stage during leaf development.

Stomata are pores in the epidermis of plants that are encircled by two guard cells that control the aperture’s opening and closure.

These guard cells are encircled by subsidiary cells, which serve as a support system for the guard cells. The growth of stomata, particularly their density on the leaf surface, is influenced by environmental factors.

Epidermis Plant Tissue – Importance