1 / 20

Plant Tissues

Plant Tissues. Michael Pettibon. Concept of Tissue. Primary Tissues Systems. Meristems Dermal Ground Vascular. Origin of Primary Tissues. The General Location of the Primary Tissue Systems in a Dicot Root. Apical Meristems.

tad-pena
Télécharger la présentation

Plant Tissues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Plant Tissues Michael Pettibon

  2. Concept of Tissue

  3. Primary Tissues Systems • Meristems • Dermal • Ground • Vascular

  4. Origin of Primary Tissues

  5. The General Location of the Primary Tissue Systems in a Dicot Root

  6. Apical Meristems • Responsible for the primary body of the plant and for the increase in length of the plant. • Protoderm gives rise to the dermal tissue • Procambium gives rise to the vascular tissue • Ground meristem gives rise to the ground tissue • Pith – found in the center of the stems and some roots • Cortex – formed under the epidermis

  7. Lateral Meristems • Responsible for increase in plant diameter or girth, known as secondary growth. Form in mature regions of the roots and shoots. Serves to make the plant sturdier. Two types • Vascular cambium – produces secondary xylem and phloem (vascular tissues). Runs the length of the stems and roots. • Cork cambium – produces periderm which helps protects the underlying tissues.

  8. Ground Tissues • Tissues that occur throughout the plant and function for storage, metabolism and support. • Three type of cells; • Parenchyma; thin walled cells with primary cell walls only, found throughout the plant, form the pith and cortex tissues. Responsible for wound healing. • Collenchyma; thick cell walls, form under the epidermis of the plant and near the petioles. Used for support in young plants. • Sclerenchyma: tough, thick cell walls occurs in all of the primary and secondary plant bodies. Cell walls impregnated with lignin (polysacc.). Two types occur • Sclerids – varied branched, gritty taste in pears is due to sclerids • Fibers – long, slender cells that occur in bundles.

  9. Dermal Tissues • Epidermis – outermost layer of the leaves, fruit, and roots. Cuticle helps prevent water loss and stomata cells aerate internal tissues and regulate amount of gases and water vapor in the aerial parts of the plants. • Guard cells regulate the opening of the stomata • Periderm – Located under the epidermis, replace epidermis as the protective tissues in the roots and stems.

  10. A Close View of the Guard cells, Subsidiary Cells, and Other Epidermal Cells

  11. The General Location of the Primary Tissue Systems in a Dicot Stem

  12. PRIMARY VASCULAR TISSUES • Complex tissues • Xylem • Phloem • Origin: • procambium

  13. Xylem – water and mineral conducting tissue in plants, mechanical support and storage of water and nutrients . Two types of cells; Tracheid – mainly found in gynosperms and seedless vascular plants. Vessel Elements – chief water conducting element in angiosperms. Parenchyma – storage Fibers – storage and support Vascular Tissues

  14. XYLEM • Origin: • primary • procambium • secondary • vascular cambium

  15. XYLEM • Tracheids • long cells with pits and lignified wall • slanted end walls to place as many pits as possible. • most primitive type of cells • Found primarily in gymnosperms (non-flowering plants such as pines and spruces)

  16. Vessels Vessel members single units of vessel members form a vessel end walls are perforated The primary wall is dissolved leaving a large hole between two elements: perforation plate Found primarily in angiosperms (flowering plants. XYLEM

  17. Phloem • Conduct dissolved food (mainly sucrose) • Four types of phloem cells • Sieve cells • Albuminous cells • Sieve tube elements • Companion cells • Parenchyma – storage • Fibers – storage and support

  18. Phloem • Origin: • primary • procambium • secondary • vascular cambium

  19. Phloem • Sieve cells • Elongated in shape and tapered • Main food conducting cell in gymnosperms • Albuminous cells • Exist closely with the sieve cells • Aid in the movement of food, informational molecules and ATP into and out of the sieve cells.

  20. Phloem • Sieve tube elements • Long, food conducting cells in angiosperms. • Only cell in plants that lack nuclei, but are living. • Have sieve areas and a plate with larger sieves at either end called sieve plates. • Companion cells • Exist in association with the sieve tube elements and aid in the movement of food, informational molecules and ATP into and out of the sieve cells

More Related