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Northwest Indian College

Welcome to Northwest Plants. Northwest Indian College. ENVS 201 Spring Quarter 2012. Plant Parts. reproductive components:. vegetative organs:. flowers. stems. fruits. roots. seeds. leaves. Today: Roots. bean seedling ( Phaseolus ) showing root system. Root Features & Functions.

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Northwest Indian College

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  1. Welcome to Northwest Plants Northwest Indian College • ENVS 201 Spring Quarter 2012

  2. Plant Parts reproductive components: vegetative organs: flowers stems fruits roots seeds leaves

  3. Today:Roots

  4. bean seedling (Phaseolus) showing root system

  5. Root Features & Functions anchor plants to substrate (e.g., soil) water and nutrient uptake may be variously modified (e.g., adventitious roots, food storage, etc.) interactions with soil, microorganisms (in root nodules) and fungi (mycorrhizae)

  6. adventitious roots (in Coleus)

  7. roots modified for food storage Carrot (Daucus) Beet (Beta) sweet potato (Ipomoea)

  8. mycorrhizal root

  9. hogpeanut (Amphicarpaea bracteata) with root nodules

  10. bacterium—> root cell—> root cells of pea (Pisum) in root nodules (infected with Rhizobium)

  11. Root Features primary root - the main root of the root system secondary root - a branch root rootlet - a small root root nodule - swelling produced by bacteria (e.g., in legumes), site of nitrogen-fixing bacteria (Rhizobium)

  12. Root Types taproot system (common in eudicots, e.g., dandelion, burdock & carrot) fibrous root system (monocots, e.g., grasses, and some eudicots) adventitious roots (e.g., Coleus)

  13. taproots of burdock (Arctium) & dandelion (Taraxacum)

  14. Root Regions root tip - tip (apex) of a young root root apical meristem - produces cells that lengthen roots root lateral meristem (vascular cambium) - produces cells that thicken roots, vascular tissues root cap - mass of cells at root tip, protective & maintains downward growth root hair - outgrowth of outer cell of root, extends absorbing region of root

  15. root tip root l.s. showing root tip <—apical meristem <—root cap

  16. root hairs (in grass seedling)

  17. vascular—> cambium basswood (Tilia) lateral meristem (vascular cambium)

  18. Questions & Comments?

  19. Roots are cool.

  20. Hy’shqe!

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