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Chapter 8: Roots - Coggle Diagram

- - - - ectomycorhizal relationship
        
        fungal hyphae penetrate between the outermost root cortex cells but never invade the cell themselves
      - Endomycorrhizal association
        
        hyphae penetrate the root cortex as far as teh endodermis.
        
        passes through the cell walls of the cortex but cannot pass the casparian strip
- - - - mitotically inactive central region
  - - - represent the passageways for the absorption of minerals
    - - water pressure caused by poewrful absorption of water
- - - - A straight tapering root growing vertically downward
      - subsidiary rootlets spring develop from the centre
    - - usually formed by thin, moderately branching roots growing from the stem
      - universal in monocotyledonous plants and ferns
    - - produce during both normal develpoment and in response to stress conditions, like flooding, nutrient and wounding
      - increase the absorption and transportation capacity of root
  - - - thick layer of cell
      - protects root apical meristem
    - - complex polysaccharideds secreted by root cap of dicotylendenous
      - lubricants the passage of root through soil
    - - where the cell undergoes division and expansion
    - - behind the zone of elongation
      - many of epidermal cell extend out as narrow trichome