Plant Hydraulics: Water Transport and Photosynthesis

Explore the fascinating world of plant hydraulics through the lens of water transport and photosynthesis. Delve into the cohesion-tension theory, air seeding hypothesis, and the impact of soil moisture on plant conductance. Discover the intricate mechanisms that govern how plants move water and nutrients.

• Plant Hydraulics
• Water Transport
• Photosynthesis
• Cohesion-Tension Theory
• Air Seeding Hypothesis

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1. Modeling Whole Plant Water Transport: Introduction to Plant Hydraulics Michael Tobin Natural Sciences Department University of Houston-Downtown

2. Photosynthesis

3. Spongy parenchyma Upper epidermis Vascular bundle (vein, xylem & phloem) Palisade parenchyma Lower epidermis Stomate Intercellular air spaces Science photo library

4. Linking photosynthesis and water transport transpiration

5. Cohesion-Tension Theory of Water Transport

7. pit

8. Cohesion-Tension Theory of Water Transport What happens when the soil begins to dry out?

9. Air seeding hypothesis

10. Air seeding hypothesis

11. Photo: A.L. Jacobsen Air emboli will reduce conductance (transport efficiency)

12. Ceanothus leucodermis Vulnerability Curves Loss of hydraulic conductivity (%) 100 80 60 40 20 Burned Unburned 0 1.5 Ks (kg m-1 MPa-1 s-1) 1.0 0.5 0.0 -8 -6 -4 -2 0 Xylem water potential (MPa)

13. Questions?