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Plant tissues (tbp)

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Donated to SIYAVULA by Jenna Hellack

Donated to SIYAVULA by Jenna Hellack

Published in: Technology, Education

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  • 1. Plant Tissues: Overview Many of the figures found in this presentation are from the internet site http://botit.botany.wisc.edu/images/130/ and a CD entitled “Plant Anatomy” by Richard Crang & Andrey Vassilyev published by McGraw Hill.
  • 2. Meristematic tissues – localized regions of cell division
    • Apical Meristems
      • Primary or Transitional Meristem  Primary growth
    • Lateral Meristems
      • Vascular cambium  secondary vascular tissues
  • 3. Illustration from: http://biology.nebrwesleyan.edu/benham/mitosis/
    • Interphase
    • Prophase
    • Metaphase
    • Anaphase
    • Telophase
    • Cytokinesis
    Cell Division: Mitosis (nuclear division) + Cytokinesis (cytoplasmic division)
  • 4. Shoot Apical Meristem
  • 5. Root Apical Meristem
    • Root cap initials
    • Protoderm
    • Ground meristem
    • Procambium
    • Root cap
  • 6. Lateral Meristems – secondary growth in woody plants Basswood – root in cross section Basswood – stem in cross section; 1, 2, 3 year old stems
  • 7. Simple Tissues – consisting of one cell type
    • Parenchyma – thin walled & alive at maturity; often multifaceted.
    • Collenchyma – thick walled & alive at maturity
    • Sclerenchyma – thick walled and dead at maturity
      • Sclerids or stone cells – cells as long as they are wide
      • Fibers – cells longer than they are wide
    • Epidermis – alive at maturity
      • Trichomes – “pubescence” or hairs on epidermis
      • Root Hairs – tubular extensions of epidermal cells
  • 8. Parenchyma
  • 9. Collenchyma
  • 10. Sclerenchyma Right-hand illustration modified from: Weier, Stocking & Barbour, 1974, Botany: An Introduction to Plant Biology, 5th Ed. SCLERIDS FIBERS
  • 11. Epidermis – stoma, trichomes, & root hairs http://www.ucd.ie/botany/Steer/hair/roothairs.html
  • 12. Complex Tissue
    • Xylem – water conducting tissue; parenchyma, fibers, vessels and/or tracheids, and ray cells.
    • Phloem food conducting tissue; sieve-tube members (no nucleus at maturity, cytoplasm present), companion cells, fibers, parenchyma, and ray cells.  In flowering plants, sieve-tube members and companion cells arise from the same mother cell. 
    • Periderm – protective covering; composed of cork and parenchyma.
    • .
  • 13. Xylem
  • 14. Phloem
  • 15. Vascular Bundles with xylem & phloem Maize or Corn – vein in cross section Alfalfa – vein in cross section