The characteristic feature of Sclerenchyma cells with lignified thickening at the corner

Sclerenchyma cells are a type of plant cell that provide structural support to the plant. They have thickened secondary cell walls, which are reinforced with lignin. The lignified thickening in sclerenchyma cells is particularly prominent at the corners of the cells. This feature gives these cells their characteristic shape and strength.

Sclerenchyma cells
Sclerenchyma cells are one of the three main types of plant cells, along with parenchyma and collenchyma cells. They are dead at maturity and have highly thickened secondary cell walls. Sclerenchyma cells are specialized for providing support and protection to the plant. They are found in various parts of the plant such as stems, roots, and leaves.

Lignified thickening
Lignin is a complex polymer that provides rigidity and strength to the cell walls of sclerenchyma cells. It is deposited in the secondary cell wall, which is formed inside the primary cell wall after cell expansion has ceased. Lignin makes the cell walls more resistant to mechanical stress and degradation. It also provides protection against pathogens and helps the cells withstand physical forces without collapsing.

Corner thickening
The lignified thickening in sclerenchyma cells is particularly prominent at the corners of the cells. This is because the corners experience the highest mechanical stress and therefore require extra reinforcement. The thickening at the corners enhances the overall strength and rigidity of the cell, allowing it to provide effective support to the plant.

Function of sclerenchyma cells
Sclerenchyma cells have several important functions in plants. They provide mechanical support to the plant by forming a strong framework. They also help in conducting water and nutrients through the plant. In addition, sclerenchyma cells can provide protection to delicate tissues, such as the phloem, by forming a hard and rigid protective layer.

Conclusion
The characteristic feature of sclerenchyma cells is the presence of lignified thickening at the corners. This feature provides additional strength and support to the cells, allowing them to play a vital role in the structure and function of plants.