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Chapter 6 Roots

Chapter 6 Roots. Plant organ systems. What are the primary functions of roots?. Fibrous and taproot systems. Dicots. Monocots. Root structure. Root cap. Parenchyma Mucigel Perception of gravity. Dicot root, l.s. Region of cell division Region of elongation. Region of maturation.

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Chapter 6 Roots

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  1. Chapter 6 Roots Plant organ systems

  2. What are the primary functions of roots?

  3. Fibrous and taproot systems

  4. Dicots Monocots

  5. Root structure

  6. Root cap • Parenchyma • Mucigel • Perception of gravity

  7. Dicot root, l.s. • Region of cell division • Region of elongation

  8. Region of maturation

  9. Mature root structure

  10. Monocot root, c.s.

  11. Dicot root, c.s.

  12. Xylem Phloem Endodermis

  13. Endodermis regulates mineral absorption

  14. Lateral (branch) roots

  15. Endodermis Pericycle

  16. Specialized roots • Storage roots

  17. Propagative roots

  18. Pneumatophores

  19. Cypress pneumatophores, Black River, NC

  20. A barrel cactus 2 feet tall and 1 foot in diameter has roots more than 10 feet long. However, all of the roots are found in the soil no deeper than 6 inches. Why would a plant in such a dry climate have such shallow roots?

  21. Aerial roots

  22. Aerial roots (poison ivy)

  23. Aerial roots • Velamen (orchids)

  24. Aerial roots – velamen (orchids)

  25. Aerial roots?

  26. Contractile roots

  27. Buttress roots

  28. Prop roots

  29. Prop roots

  30. Prop roots – Mangrove swamp

  31. Mycorrhizae • A mutualistic fungal association with roots

  32. Mycorrhizae

  33. Root nodules

  34. Root nodules

  35. Root nodules

  36. Nitrogen fixation research Ammonia diffusion hypothesis of nitrogen transport into plants

  37. Group activity • If N is supplied as alanine, what does this imply the plant is able to do? • As a scientist, what would you look for in a plant that would support the hypothesis that N is supplied as alanine?

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