Structure of Phloem Tissue

The phloem is a specialized vascular tissue in plants. It is responsible for the transport of organic nutrients, primarily sugars, from the site of photosynthesis to other parts of the plant. The diagram of phloem shows the structure as follows:

1. Sieve Tubes: Sieve tubes are the primary cells responsible for transporting nutrients.
   • They are elongated, tube-like structures with perforated end walls called sieve plates.
   • Sieve tubes lack a nucleus, ribosomes, and a vacuole. It form a continuous channel for efficient sap flow.
   • The sieve plates allow the movement of sap from one sieve tube to another.
2. Companion Cells: Companion cells are closely associated with sieve tubes. It provide essential support and metabolic functions.
   • They contain a nucleus and numerous organelles that supports the metabolic needs of both the companion cell and the adjacent sieve tube.
   • Plasmodesmata connects the sieve tubes to companion cells. It carry out the exchange of substances.
3. Parenchyma Cells: Parenchyma cells are loosely packed, living cells with a variety of functions.
   • They store and metabolize various substances, including starch and lipids.
   • Parenchyma cells are involved in the repair and regeneration of phloem tissue.
4. Fibers: Fibers are long, slender cells that provide structural support to the phloem.
   • They are often found on the outer side of the phloem. It add strength to the tissue.
   • The fibers provides rigidity and strength to the plant.
5. Phloem Parenchyma: Phloem parenchyma cells are specialized parenchyma cells associated with the phloem.
   • They play a role in nutrient storage, particularly in the form of starch grains.
   • Phloem parenchyma cells may also be involved in the repair and regeneration of phloem tissue.

Also Read: Difference Between Xylem And Phloem

The Diagram of Phloem Tissue helps us understand the structure and function of the phloem tissue. Phloem tissue is a vascular plant tissue responsible for transporting sugars, amino acids, and other organic nutrients. The labelled diagram of phloem tissue shows that it consists of sieve tube elements, companion cells, and phloem parenchyma. The phloem plays an essential role in the distribution of nutrients throughout the plant. In this article, we will learn about the phloem tissue and its structure with the help of a diagram of the phloem.