Plants’ parenchyma is a simple permanent tissue found underneath the epidermis. It is made up of live cells that have thin cell walls and are loosely packed to allow for intracellular space. Because parenchyma contains chlorophyll, it participates in photosynthesis.
It offers storage capabilities as well as other features. The parenchyma cell wall is made up of cellulose and contains vacuoles and a nucleus. Permanent tissues are those that have reached full maturity and have lost their ability to divide. The permanent tissues are formed when the meristematic tissues divide and differentiate.
Permanent Tissue Types
Permanent Tissue (Simple)
Homogeneous tissues are another name for this type of tissue. They are made up of a single cell type, which has the same origin, structure, and function in most cases.
Simple permanent types:
1. Parenchyma
- The cells are oval or circular in form
- Hemicellulose or cellulose make up the cell wall
- The cell has a very thin wall
- Vacuoles and a tiny nucleus are present in the cells
- It can be found throughout the plant
- Protoplasm is thick and alive
2. Collenchyma
- Long and thick-walled cells
- Cellulose and pectin make up the cell wall
- Due to the presence of pectin, it is the only tissue with the highest refractive index
- It’s present in the dicot leaf’s epidermis and vascular bundle
- In the cells, the amount of chloroplast is lower
- There are no intercellular gaps between the cells
3. Sclerenchyma
- These are dead tissues with a stiff and hard feel
- Cells have sturdy walls and come in a variety of sizes and shapes
- These give the plant mechanical support and rigidity
- Tissue that is persistent and complex
The complex tissues are made up of different types of cells that perform different roles and are divided into two categories:
4. Tissues of the Laticiferous
- Latex is found in plant tissues
- They are derived from meristematic tissues and mature in conjunction with other tissues
- The cells are multinucleated, elongated, and have thin walls
- It can be found in a variety of plant families, including Euphorbiaceae, Apocynaceae, Compositate, and others
5. Tissues of the Glandular System
- They have glands that secrete oil, resins, tannin, mucilage, and other substances
- On the epidermis, the gland is located
Sclerenchyma
Sclerenchyma is derived from the Greek word “skleros,” which means “hard,” and the suffix “enchyma,” which means “cellular tissue.”
Sclerenchyma cells, as previously indicated, are primarily responsible for structural support. Because of its structure, each cell type may carry out its specialised purpose. Thus, the primary roles of sclerenchyma cells are to strengthen tissues, sustain plants, and aid in the formation of structures.
Sclerenchyma in plants is a supporting tissue made up of a variety of hard woody cells.
Once matured, sclerenchyma cells are usually dead cells with severely thickened secondary walls containing lignin.
These cells are inflexible and non-stretchable in nature and can be found in non-growing regions of plants such as bark and mature stems.
Sclerenchyma is one of the Plant’s three ground and fundamental Tissues.
Sclerenchyma can be found in the stems around the vascular bundles, the veins of the leaves, and the hard covering of the fruit, seed, and nuts, among other places. Coconut husk is formed of the same Tissue as well.
Complex Tissue
Xylem
- It delivers water and nutrients from the plant’s roots to its leaves
- It aids the growth of the plants
- Tracheids, vessels, xylem fibre, and xylem parenchyma are the four divisions
Phloem
- It transports ready-to-eat organic food from the leaves to various areas of the plant
- Bast is another name for it
- Sieve tubes, companion cells, phloem parenchyma, and phloem fibers make up this structure
- Tissues of a Particular Kind
- They are of two sorts, both of which have been structurally changed to carry out secretory tasks in nature
What is Bone Tissue and How Does It Work?
Bone tissue is a type of connective tissue present in the bone membrane. It’s hard so that the bones can maintain their stiffness. Osseous tissue is another name for bone tissue. The matrix substance in bone tissue is divided into two categories.
Strength and flexibility are provided by the first type, which is made up of collagen and elastic fibers. The second type is hard because it is made up of minerals, salts, and calcium. The right amounts of both types of matrix material in bone tissue give it the flexibility and rigidity it needs.
Conclusion
In simple terms, a plant’s permanent tissues are those that contain nondividing cells.
In the plants, the cells are also changed to execute certain functions. Meristematic tissue gives rise to the cells of permanent tissue.
The cells that make up the permanent tissue are also fully differentiated. The cells are massive and uniform in size and shape.
Intercellular gaps can be seen in the spaces between the cells. Inside these cells, there are also large vacuoles. The metabolism in the cells of permanent tissue occurs at a much slower rate.