1. Chapters summary
Water transport in plants (7 min) (start at 1:40)

2. Interesting… 76.8 Kg Willow tree Five years…
90.9 kg soil Kg Soil!
Was it H20? Air? No! it is C02!
Seedling

3. General Sherman

5. Fig 37.2

8. Where is the oldest ring?
Primary xylem
Secondary xylem
Primary phloem
Secondary phloem
NAIL?
Where is the oldest ring?

9. Primary vs. Secondary Primary Lengthen at roots/shoots
Apical Meristems
“pinching back”
Secondary
Growth in thickness
Woody stems
Lateral meristems
Vascular cambium
Cork cambium
Fig 35.10

13. Apical dominance

16. “Source-to-sink” Translocation: Phloem transport
Mature leaves (source)
Growing tissues, root stores & fruits (sink)
Pressure Flow Hypothesis

17. Roots
Mycorrhizae (fig 37.12)
N fixation (figs 37.9, 37.11)

18. Nitrogen
Is needed for proteins, nucleic acids, other organic molecules

19. What is meant by the photosynthesis/ transpiration compromise?

20. 1. Which has more water: the air or the leaf?
Fig p.747
1. Which has more water: the air or the leaf?
2. Which is hypotonic?
3. Which has a greater Ψ?
4. How does this relate to the various environ-mental conditions in lab 9?

21. Fig 36.13

22. Transpiration (lab 9)
Cohesion
Adhesion
Tension

23.  (Osmotic Potential)  =  p +  s
> = >Potential Energy to do work/move
Areas with more water usually have the higher water potential ().
 =  p +  s

24. = (-) MPa with solute (LOW H2O)
 Examples:
See Figs !
= (-) MPa with solute (LOW H2O)
= 0 MPa no solute (High H2O)
Different ways to change : add solute (-) add pressure (+) tension pressure (-)

25. Xeriscaping

26. Xeriscaping

27. Chapter 39 Control Systems in Plants
Hormone—a chemical signal that coordinates the different parts of an organism. Greek for “to excite” - produced in a specific area - travel to another specific area - (target organ) - used in minute concentrations

28. Which hormone?
How does it work?
This is what type of -tropism?

29. Darwin and Darwin’s experiments

30. Went’s experiments
(All coleoptiles have had their tips cut off.)

31. Auxin’s effects: plant elongation
Similar to fig 39.8

32. Plant Movements TROPISMS: movement toward or away from stimuli (-/+)
Thigmotropism
Gravitropism (geotropism)
Phototropism
(Chemotropism)

34. Thigmotropism

35. Chemotropism