Water and sugar transport & PLANt hormones

1
Water and sugar transport PLANt hormones
2
OSMOSIS
Which way would the water molecules (red dots) be
moving?
3
Roots

• SEM of Marjoram Root

• Mycorrhizae (fungi) interaction with plant

Mag 100X
What is the significance of increased surface
area of the roots of a plants?
4
How do plants absorb and transport water?

• 2 methods
• Root pressure
• Smaller effect
• Usually occurs at night
• push force
• Transpiration-Pull
• Larger effect
• Usually occurs during the day
• pull force

5
Root Pressure
6
Root Pressure

• Casparian Strip
• __________________________________________________
  ____
• regulates water and solutes entering xylem by
  forcing the sap to pass through cytoplasm of
  cells

7
Xylem Sap

• Maple syrup reduced sugar maple xylem sap
• Collected early spring
• Only time of year where xylem transports sugar to
  leaf buds

8
Transpiration-Pull

• Like drinking from a straw
• pulling from up effect
• __________________________________________________
  ______________

9
Did You Know!

• A maple tree can lose on average 220L of water
  per hour during the summer due to transpiration!

10
Cohesion-Tension Theory
11
Stomata
12
Cross Section of Dicot Leaf
CO2 enters via stomata for photosynthesis. But
water can escape too!
13
(No Transcript)
14
What happens to the sugar?
15
Translocation

• Translocation _________________________
• __________________________________________________
  __________________
• Movement from ________to _______
• Source ________________________
• Mature leaves
• Sink ___________________________
• Roots, shoot tips, fruits

16
Pressure-Flow Mechanism
17
Plant Hormones
What are some factors that affect plant growth?
18
Auxins

• ________________________________________
• ________________________________________
• Also trigger formation of roots, leaves and fruit
  (surrounding ovary of seed)

Seedless Veggies!
19
Cytokinins

• Promote cell division
• ______________________
• ____________________________________________

20
Giberellins

• Promote cell division and cell elongation
• _____________________________________
• _____________________

Increase fruit size, shape and appearance
21
Ethene

• _____________________________________
• Used in transporting unripened fruit to
  supermarket
• Advantages vs. Disadvantages?

22
Abscisic Acid (ABA)

• _________________________________
• __________________________________________________
  ________________________
• Promotes dormancy in seeds

After 11 days without water, the control plant
(left) is dying while the ABA analog-treated
plant (right) remains healthy.
23
Homework ?

• Section 14.3 and 15.1
• Pg.404 1-3
• Pg.416 2,3,5,6,9,17