Transport in plants

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 (?S)?
• Is ?S positive or negative?
• What is pressure potential (?P)?
• Is ?P positive or negative?
• What is WATER POTENTIAL (?)?
• ?S ?P
• Pure water has no water potential
• ?water 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 ?S?
• What happens to ?p?
• RememberXYLEM 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
(No Transcript)
14
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

15
Fig. 39.17a
16
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

17
(No Transcript)
18
Fig. 39.17b
19
Back to the sugar

• What are the biologically relevant forms of
  energy?
• Light energy
• Electrical energy
• Chemical
• Concentration gradients

20
Plant productivity

• 720 billion tonnes of global carbon every year
• 10 is sugar
• 0.0001 is CO2
• Where does the sugar come from

21
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

22
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

23
(No Transcript)