Tracheid and vessel elements

xylem tissues

1. Tracheid and vessel elements Trần Thị Hiền Hoàng Ngọc Ánh

2. Dead cells .They are nonliving at maturity. Tubular cell. Both are more or less elongated cells that have lignified secondary walls. Form long columns, place one above the other . Similarity

3. Figure 1 Xylem

4. Figure 2

5. Difference Tracheid Long, tubular cells with tapering ends. Tracheids are imperforate cells having only pit-pairs on their common walls. Water flowing from tracheids to tracheid must pass through the pit membranes of pit-pair in their overlapping wall Vessel elements Cells are s horter . Cells aren’t as tapering as tracheids . Vessel elements are perforated at their end. Perforations are areas lacking both primary and secondary walls through which the vessel elements are interconnected.

6. Types of tracheid

7. Perforations plate A single perforation (simple perforation plate). Several perforations (multiple perforation plate) Scalariform perforation plate. Reticulate perforation plate. Foraminate perforation plate .

8. Pits Simple and bordered pits are found in the secondary walls of tracheid and vessel elements of the latest formed primary xylem and of the secondary xylem

9. Thank You! Have a nice day!