Movement of water at the tissue

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Movement of water at the tissue

  1. 1. Movement of Water at the Tissue/Organ LevelFrom Cell to Cell, Through the Root to the Stem Apoplast Symplast
  2. 2. Water Absorption by Roots• Surface is increased by: – Root hairs – Mycorrhizae - 90% of terrestrial plants • Fungus attached to roots – Hyphae form a mycelium – Hyphae grow into the root , between plant’s cells
  3. 3. Apoplast Symplast• Water and minerals are passed from the root epidermis through the cortex to the stele via apoplast or symplast
  4. 4. Water Movement Through Tissues• Symplast – pathway through the cytosol of adjacent cells via plasmodesmata• Apoplast – water movement through the cell walls• Transmembrane - slow
  5. 5. Symplast Pathway• Central vacuole – stores water/minerals – Tonoplast - membrane • Proton pumps in the tonoplast, pump H+ into the vacuole • Other active transport moves soil minerals into the vacuole (K+) • Makes the cytosol hyposmotic (increases Ψs )
  6. 6. Apoplast Pathway• Materials flowing along the apoplastic route are blocked by the waxy (suberin) Casparian strip at the endoderm• Must enter endodermal cells to move into the xylem – Enables endodermal cells to extract (active transport) minerals from soil
  7. 7. Movement Through Tissues• Water passes through the cortex to the stele (xylem – tracheids/vessel elements)

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