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Epidermis-II

Epidermis-II. Guard Cells in Cucumber. Stomata. Guard cells. Unevenly thickened wall. Distribution of Stomata. Guard cells level with epidermal cells. Ficus sunken stoma. Hakea sunken stoma. Sunken stoma in pine needle.

peter-nguyen
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Epidermis-II

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  1. Epidermis-II

  2. Guard Cells in Cucumber

  3. Stomata

  4. Guard cells

  5. Unevenly thickened wall

  6. Distribution of Stomata

  7. Guard cells level with epidermal cells

  8. Ficus sunken stoma

  9. Hakea sunken stoma

  10. Sunken stoma in pine needle Also note that epidermal cells are sclerified and fibers occur beneath the epidermis

  11. Oleander stomata in crypt

  12. Yucca stomata in channels

  13. Guard cells and Subsidiary Cells

  14. Stomatal Development • Mesogenous – guard cells and subsidiary cells have a common origin • Perigenous – guard cells and subsidiary cells DO NOT have a common origin • Mesoperigenous – some subsidiary cells have a common origin with guard cells

  15. Some of the common developmental patterns • Anomocytic – no subsidiary cells • Diacytic – two subsidiary cells at right angles to the guard cells • Paracytic – two or more subsidiary cells parallel the guard cells • Actinocytic – subsidiary cells seem to radiate from guard cells • Anisocytic – three unequal-sized subsidiary cells surround the guard cells

  16. Anomocytic

  17. Diacytic

  18. Paracytic

  19. Trichomes • Nonglandular trichomes • Unicellular trichomes • Multicellular trichomes • Uniserate • Multiserate • Stellate hairs • Candelabriform hairs • Peltate hairs or scales • Glandular trichomes – stalk and glandular head

  20. SEM of tobacco leaf surface

  21. Papillae in Colocasia leaf Ordinary epidermal cells with papillae or short trichomes?

  22. Corn leaf with a unicellular trichome

  23. Multicelluar uniserate trichomes

  24. Branched trichomes

  25. Peltate trichomes in olive

  26. Stellate trichomes

  27. Glandular trichomes in potato leaves

  28. Glandular trichomes in alfalfa

  29. Trichomes in lavender leaves

  30. Glandular trichome in Venus fly trap

  31. Unusual Epidermal Cells • Lithocysts • Silica cells and cork cells • Bulliform cells • Multiple epidermis and hypodermis

  32. Lithocysts containing a cystolith

  33. Silica cells and cork cells in grass leaves

  34. Bulliform cells

  35. Multiple epidermis

  36. Periclinal divisions in the epidermis give rise to a multiple epidermis

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