1. Lecture
PLANTS TISSUES
Authors
as. Kernychna I.Z.

2. 1.Meristematic tissues. 2. Dermal tissues. 3. Secretory tissues.
Plan
1.Meristematic tissues.
2. Dermal tissues.
3. Secretory tissues.
4. Parenchyma.

3. In the body plants cells not isolated, but placed groups - on the basis of community of origin, structure and functions. These groups of cells name tissues.

4. Many classification Living and dead; meristematic and constant;
Simple and complex;
Primary and secondary

5. The tissues of a plant are organized into three tissue systems: the dermal tissue system, the ground tissue system, and the vascular tissue system

6. Classification tissues
Simple tissues are:
Parenchyma
Chlorenchyma
Collenchyma
Sclerenchyma
Complex tissues are:
DERMAL
XYLEM
PHLOEM
Classification tissues

7. Meristematic tissues:
the cells are small,
the cells walls are thin,
cells have large nuclei,
vacuoles are absent or very small, and
there are no intercellular spaces.

8. Plants have four types of meristems:
apical, lateral, intercalary, and wound
(or regeneration).

9. Dermal tissues
cover the plant body

10. There are two types of dermal tissue:
The primary is:
epidermis
The secondary is:
periderm

11. Epidermis is closely packed, without intercellular spaces
or chloroplasts. The outer walls
may be covered waxy, waterproof
cuticle

12. Guard cells contain chloroplasts and regulate gas exchange between the inside of the leaf and the surrounding air.

13. branched or unbranched Branched hairs can be dendritic
Trichomes- on plants are epidermal outgrowths of various kinds.
Trichomes
may be unicellular
or multicellular,
branched or unbranched
Branched hairs can be dendritic
(tree-like),
tufted, or stellate (star-shaped).

14. Epidermal hairs lower water loss by decreasing the flow of air over the plant surface, which in turn, slows the loss of water from the plant.
Glandular hairs (secretory) prevent herbivory by storing substances that are harmful to insects.
Root hairs increase water uptake by increasing the surface area of the cell.

15. Epidermis is short lived in many plants.
When epidermis ruptures a secondary dermal
tissue periderm that concist of phellogen (cork cambium),
phellem (cork),
phelloderm (secondary cortex) replaces it.

16. SECRETORY TISSUES OF PLANS
secretory structures:
external secretory structures (nectaries, hydathodes, secretory hair)
- internal secretory structures
(secretory cells, canals, ducts, cavities, laticifers).

17. Resin canals

18. Internal secretory structure:
- laticifers (of dantelion);

19. OIL CANALS

20. Parenchyma

21. Types parenchyma
1. Chlorenchyma
2. Aerenchyma
3. Storage parenchyma

22. Chlorenchyma
: contains chloroplasts and functions in photosynthesis

23. Chlorenchyma of leaves

24. STORAGE PARENCHYMA: characterized by large accumulations of storage products such as starch, protein, oil, hemicellulose or water.

25. Aerenchyma contains large intracellular air spaces and functions in
gas exchange.