Periderm

Periderm is a secondary integumentary tissue that is formed during plant growth and replaces the primary epidermis. The periderm consists of several layers of cells - phellem, phelloderm and phellogen.

Phellema is the outer layer of dead cells that contain suberin and prevent water evaporation. Phelloderm is an intermediate layer of living cells. Phellogen is the inner layer of cells that ensures the division and formation of new periderm cells.

The periderm protects the internal tissues of the plant from damage, protects against moisture loss, and prevents the penetration of pathogenic fungi and bacteria. In woody plants, the periderm forms the bark.

Peridermal dermal cell cultures are plant cell lines obtained from the epidermis of plants and preserving its morphological characteristics. To create periderm using the ethyl acetate method (411±2.59 mg/ml), it is necessary to carry out elimination before distillation of plant substances, because thus, their interaction with chloroethane does not occur. Using this method, seven periderm cell lines of three experimental cultures were obtained at different times and 4.5 kg of plant raw materials, as well as five high-yielding varieties of 30 kg each. The resulting periderms lack extractive