Sieve Tubes vs Sieve Cells
(Similarities and Differences between Sieve Tubes and Sieve Cells)
Phloem is a permanent vascular tissue system associated with the conduction of food materials in plants. It is a complex tissue composed of more than one type of cells namely sieve elements, companion cells, phloem fibres and phloem parenchyma. Among these cells, the sieve elements are the most specialized cells in the phloem performing the conduction of food materials. There are two types of sieve elements are described among vascular plants based on structural complexity and evolutionary significance. They are (1) Sieve Cells and (2) Sieve Tubes. The present post describes the similarities and differences between sieve cells and sieve tubes as a comparison table.
Similarities between Sieve Cells and Sieve Tubes
Ø Both sieve cells and sieve tubes components of phloem.
Ø Both are the sieve elements (a category of phloem cells).
Ø Both sieve cells and sieve tubes transport food materials.
Ø Both are living cells.
Ø Both cells have thin primary cell wall (secondary thickening absent).
Ø Both contain dense granular protoplasm.
Ø Nucleus is absent in both sieve cells and sieve tubes.
Ø Both present in primary and secondary phloem.