1. Transport in plants

2. Transport in plants

3. Transport in plants

4. Transport in plants

5. Transport in plants

6. Solute transport in plant cells

7. Solute transport in plant cells

8. Water potential and water movement
y = water potential
(MPa megapascals)
1MPa = 10atm
y = yp + ys

9. Water relations of plant cells
Cell y > Environment y
Cell y < Environment y

10. Tomato plant regains its turgor

11. Lateral or Short Distance routes for transport

12. Lateral or Short Distance routes for transport

13. Lateral transport of minerals and water in roots

14. Guttation: result of nocturnal building of root pressure (ys) (pushing of Xylem sap)

15. Xylem sap ascent: the Transpiration-Cohesion-Tension mechanism

16. Ascent of water in a tree - role of hydrogen bonding

17. Maple tree Transpiration: 200 liters/day
75 cm/min

18. Leaf Stoma: Photosynthesis –Transpiration compromise
90% water loss through Stoma
Transpiration to Photosynthesis ratio
600:1 (C3) :1 (C4)

19. Stomata on the underside of a leaf

20. Transpiration larger than Xylem delivery: loss of turgor

21. The mechanism of stomatal opening and closing
Daytime – Open
Nightime - Closed

22. The mechanism of stomatal opening and closing
Light triggered accumulation K+ in guard cells
CO2 Depletion in leaf airspaces
Internal clock in guard cell: Circadian Rythm

23. Phloem sap transport: Bidirectional flow between sugar sources and sink

24. Phloem transport:
From source to sink
Pressure Flow:
High osmotic pressure near source which “pushes” water towards sink

25. Aphids and Phloem Research