LEAF ANATOMY<br />Post lab discussion<br />
Leaf <br />Early termination of apical growth<br />Conducting tissues= veins<br />Arrangement of tissues in petiole= stem<...
Tissues of the leaf<br /><ul><li>Epidermis
Two surfaces
Upper- Adaxial
Lower- Abaxial
With cuticle
Stomata
Trichomes
Mesophyll
Parenchymatous
Photosynthetic</li></ul>(chlorenchyma)<br />
epidermis<br />In most plants the epidermis is single layered.<br />epidermis<br />Others, as in rubber tree plant, have m...
Type of parenchyma<br />Palisade– rod shaped; usually in the adaxial side; where majority of chloroplasts are found<br />S...
Cross section of a leaf<br />cutting through a vein<br />cuticle<br />stoma<br />adaxial epidermis<br />palisade mesophyll...
Types of mesophyll<br />Dorsiventral or bifacial<br />palisade on one side; spongy on the other side<br />Isobilateral or ...
Dicot leaf- palisade developed<br />Monocot leaf- uniform<br />Dorsiventralmesophyll or bifacial<br />Uniform type of meso...
Structure of the petiole<br />If single collateral bundle: phloem is abaxial<br />If bundles arranged in rings: phloem is ...
Veins<br />Vascular bundles  or + assoc. non vascular tissues that surround it<br />Vascular Bundles of similar dimensions...
Veins<br />Usually have bundle sheath (parenchymatous)<br />- inconspicuous in C3 plants<br />- enlarged in C4 plants<br /...
Cross-section through the midvein<br />
upper epidermis<br />xylem<br />cuticle<br />collenchyma<br />cuticle<br />phloem<br />lower epidermis<br />parenchyma<br ...
Commissural bundles<br />
Kranz anatomy ( bundle sheath)<br />
In C4 plants like the corn, the bundle sheath is the site of the Calvin cycle reactions <br />
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Leaf Anatomy

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Post lab lecture on anatomy of leaf

Leaf Anatomy

  1. 1. LEAF ANATOMY<br />Post lab discussion<br />
  2. 2. Leaf <br />Early termination of apical growth<br />Conducting tissues= veins<br />Arrangement of tissues in petiole= stem<br />
  3. 3. Tissues of the leaf<br /><ul><li>Epidermis
  4. 4. Two surfaces
  5. 5. Upper- Adaxial
  6. 6. Lower- Abaxial
  7. 7. With cuticle
  8. 8. Stomata
  9. 9. Trichomes
  10. 10. Mesophyll
  11. 11. Parenchymatous
  12. 12. Photosynthetic</li></ul>(chlorenchyma)<br />
  13. 13. epidermis<br />In most plants the epidermis is single layered.<br />epidermis<br />Others, as in rubber tree plant, have multiple layers <br />allowing them to occupy varied selective habitats<br />
  14. 14. Type of parenchyma<br />Palisade– rod shaped; usually in the adaxial side; where majority of chloroplasts are found<br />Spongy parenchyma—lobed cells; volume of intercellular spacer is larger<br />
  15. 15. Cross section of a leaf<br />cutting through a vein<br />cuticle<br />stoma<br />adaxial epidermis<br />palisade mesophyll<br />vein<br />spongy mesophyll<br />air spaces<br />abaxial epidermis<br />stoma<br />
  16. 16. Types of mesophyll<br />Dorsiventral or bifacial<br />palisade on one side; spongy on the other side<br />Isobilateral or isolateral or unifacial<br />Palisade present on both sides<br />Convergent or uniform<br />Mesophyll cells look the same; no distinct palisade and spongy parenchyma<br />
  17. 17. Dicot leaf- palisade developed<br />Monocot leaf- uniform<br />Dorsiventralmesophyll or bifacial<br />Uniform type of mesophyl<br />Types of mesophyll<br />
  18. 18.
  19. 19.
  20. 20. Structure of the petiole<br />If single collateral bundle: phloem is abaxial<br />If bundles arranged in rings: phloem is external to the xylem<br />
  21. 21. Veins<br />Vascular bundles or + assoc. non vascular tissues that surround it<br />Vascular Bundles of similar dimensions.<br />have a large central Vascular Bundle called a Midrib<br />
  22. 22. Veins<br />Usually have bundle sheath (parenchymatous)<br />- inconspicuous in C3 plants<br />- enlarged in C4 plants<br />Larger bundles –lack sheath or with sclerenchymatous sheath<br />
  23. 23.
  24. 24. Cross-section through the midvein<br />
  25. 25. upper epidermis<br />xylem<br />cuticle<br />collenchyma<br />cuticle<br />phloem<br />lower epidermis<br />parenchyma<br />collenchyma<br />
  26. 26.
  27. 27.
  28. 28.
  29. 29. Commissural bundles<br />
  30. 30. Kranz anatomy ( bundle sheath)<br />
  31. 31.
  32. 32. In C4 plants like the corn, the bundle sheath is the site of the Calvin cycle reactions <br />
  33. 33. Specialization<br />
  34. 34. Xerophytes<br />Thick cuticle, multiseriate epidermis, stomatal crypts, abundant trichomes<br />Some tendency to be isobilateral<br />
  35. 35. Gymnosperm leaf<br />Xeromorphic<br />Presence of transfusion tissue and accessory transfusion tissue<br />TRANSFUSION TISSUE (TT)<br /><ul><li>Mixture of short tracheids, parenchyma</li></ul>ACCESSORY Transfusion Tissue<br />- not related to vascular bundles<br />
  36. 36. Vascular tissue (tracheids only)<br />Vascular tissue (phloem mainly sieve cells and<br />Albuminous cells –typical of gymnosperms)<br />Transfusion tissue<br />epidermis<br />mesophyll<br />endodermis<br />Resin duct<br />
  37. 37.
  38. 38. hypodermis<br />How many VB?<br />PX- adaxial<br />MX- abaxial<br />Mesophyll<br />- With invaginations<br />
  39. 39. hypodermis<br />Sunken stomata<br />Accessory<br />Transfusion <br />Tissue <br />endodermis<br />
  40. 40. Hydrophytes<br />Less complex<br />Less xylem<br />Cuticle minimal<br />Epistomatic (floating)<br />Gas spaces<br />

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