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Transport in plants

Transport in plants. Transport mechanisms. Passive transport Active transport Osmotic active transport Non osmotic active transport. Plant transport…. What substances move throughout a plant? Where does water go? Where does sugar go? Where to inorganic nutrients (minerals) go?

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Transport in plants

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  1. Transport in plants

  2. Transport mechanisms • Passive transport • Active transport • Osmotic active transport • Non osmotic active transport

  3. Plant transport… • What substances move throughout a plant? • Where does water go? • Where does sugar go? • Where to inorganic nutrients (minerals) go? • Where do gasses go? (ie. O2/CO2) • Where do secundary organic molecules go?

  4. Fig. 39.8

  5. Water movement • Where does water move within a plant? • How does water move at the cellular level? • Remember osmosis? • What is water potential? • Balancing osmosis

  6. Water movement • What is solute potential (ψS)? • Is ψS positive or negative? • What is pressure potential (ψP)? • Is ψP positive or negative? • What is WATER POTENTIAL (ψ)? • ψS + ψP • Pure water has no water potential • Ψwater = 0

  7. Water transport in roots • How does water enter roots? • Remember root hairs • What is the apoplastic route? • What is the symplastic route? • What is the casparian strip? • Remember subarin? • How does mineral transport help?

  8. Fig. 39.9 (Symplastic) (Apoplastic)

  9. Water transport in shoots • How does water move up the plant? • What is root pressure? • What is guttation? • When does this occur?

  10. More water transport in shoots • What is transpiration? • Where is most water lost from plants? • Remember stomata? • How does transpiration affect water potential in xylem? • What happens to ψS? • What happens to ψp? • Remember…XYLEM SUCKS!!!

  11. Fig. 39.10

  12. Controlling transpiration • How do stomata open? • The inner tube story… • How are guard cell walls specialized? • What happens when guard cells expand? • How do guard cells expand • Where salt goes, water follows! • Remember abscisic acid?

  13. Sugar movement in plants • Where are sugars produced? • What is the source? • Where do sugars go? • What is the sink? • Where are sugars needed? • How do they get there? • Remember phloem

  14. Fig. 39.17a

  15. Sugar movement in phloem • How do sugars get into phloem? • What is the concentration gradient for sucrose entering sieve tubes? • Where does energy for transport come from? • Remember respiration

  16. Fig. 39.17b

  17. Back to the sugar… • What are the biologically relevant forms of energy? • Light energy • Electrical energy • Chemical • Concentration gradients

  18. Plant productivity 720 billion tonnes of global carbon every year • 10% is sugar • 0.0001% is CO2 • Where does the sugar come from

  19. More productivity • Where does energy for photosynthesis come from? • The power of light… • Where is the trick • Remember pigments • Where do the raw materials come from? • Remember CO2, H2O

  20. Photosynthesis (C3) • What is the overall scheme • Gathering energy • Converting light  usable energy • Photophosphorylation • Making ATP, stored electrons • Using stored energy to  sugar • Calvin cycle • Biochemical baby steps • Built on THREE CARBON intermediates

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