| CELL TYPE | CYTOPLASMIC FEATURES | CELL WALL FEATURES | 3-D GEOMETRY | ||||
| Sieve Tube Element
Series of Sieve Tube Elements are longitudinally joined end to end via sieve plates to form Sieve Tubes. Closely associated with parenchyma cells called Companion Cells |
No nucleus at maturity
No chloroplasts No mitochondria Cytoplasm consists of P2 protein fibils (formally known as slime) and Convoluted and vesiculated Endoplasmic Reticulum in a parietal position (around the circumference of the cell)
|
Thickened primary cell wall with specialized
primary pit field in Sieve Plates (Transverse end walls)
Cell Wall / Lumen Ratio very small |
|