In details

Collenchyma and Sclerenchyma



Sclerenchyma: Supporting Plant Tissue (Larger Image)

What are

Collenchyma and Sclerenchyma are plant tissues responsible mainly for plant support.

Main features of the collenchyma

- The collenchyma is composed of living cells.

- The cells have a thick cell wall consisting of cellulose, pectin and other types of substances.

- They are mainly present in young and grassy plants.

- There are several types of collenchymes such as angular, tangential, annular and lacunar.

Key Features of Sclerenchyma

- The sclerenchyma has lignin (macromolecule associated with cellulose in the cell wall).

- The presence of lignin does not allow gas exchange to occur. This fact causes the death of plant cells in their maturity phase.

- We can check sclerenchyma in some plants such as jute and flax. Its dead and elongated cells are used as textile fibers for making fabrics.

- Its main functions are: to ensure the protection and resistance of seeds and fruits, as well as enabling the woody mechanical support.

- The thickness as well as the shape are varied.

- Cells associated with xylem.