| 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 fibrils (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 fields called Sieve Plates (Transverse
end walls) with large pores associated
with callose.
Analine Blue
Analine Blue + Callose
Fluoresces |
| Transverse |
Isodiametric |
| Longitudinal |
Elongated cylinder with oblique or transverse
end walls (Sieve Plates).
Longest axis is in vertical direction. |
|
