Movement of water at the tissue

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  • 1. Movement of Water at the Tissue/Organ LevelFrom Cell to Cell, Through the Root to the Stem Apoplast Symplast
  • 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. Apoplast Symplast• Water and minerals are passed from the root epidermis through the cortex to the stele via apoplast or symplast
  • 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. 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. 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. Movement Through Tissues• Water passes through the cortex to the stele (xylem – tracheids/vessel elements)