Sclerenchyma: Supporting Plant Tissue (Larger Image)
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.