Transcript BCORchapter3536db

Plant Anatomy and Transport
chapters 35 and 36
--focus on sap flow--
Sap Flow in Plants
1.
2.
3.
4.
5.
basic root structure
water flow through the cortex cells
the endodermis as a border crossing
water flow in the xylem
the fate of water in the leaf
—photosynthesis
—transpiration
—stomate function
6. sap flow and maple syrup
Figure 35.3 Radish root hairs
Figure 35.14 Primary growth of a root
epidermis
endodermis
cortex
vascular cylinder
Sap Flow in Plants
1.
2.
3.
4.
5.
basic root structure
water flow through the cortex cells
the endodermis as a border crossing
water flow in the xylem
the fate of water in the leaf
—photosynthesis
—transpiration
—stomate function
6. sap flow and maple syrup
Figure 36.11 Ascent of water in a tree
Figure 36.6 Compartments of plant cells and tissues and routes for lateral transport
Sap Flow in Plants
1.
2.
3.
4.
5.
basic root structure
water flow through the cortex cells
the endodermis as a border crossing
water flow in the xylem
the fate of water in the leaf
—photosynthesis
—transpiration
—stomate function
6. sap flow and maple syrup
Figure 36.7 Lateral transport of minerals and water in roots
Apoplast and Symplast
Crossing the endodermis boundary
Sap Flow in Plants
1.
2.
3.
4.
5.
basic root structure
water flow through the cortex cells
the endodermis as a border crossing
water flow in the xylem
the fate of water in the leaf
—photosynthesis
—transpiration
—stomate function
6. sap flow and maple syrup
A cross section of a dicot
root
(the purple is starch, the red is lignin)
vascular
cylinder
cortex
epidermis
Figure 35.10 Review of general plant cell structure
Figure 36.11 Ascent of water in a tree
Figure 35.8 Water-conducting cells of xylem
tracheids
vessel elements
Tissue: Xylem
Cell Type: Tracheary Elements
Sap Flow in Plants
1.
2.
3.
4.
5.
basic root structure
water flow through the cortex cells
the endodermis as a border crossing
water flow in the xylem
the fate of water in the leaf
—photosynthesis
—transpiration
—stomate function
6. sap flow and maple syrup
Figure 36.11 Ascent of water in a tree
Figure 10.2 Focusing in on the location of photosynthesis in a plant
Figure 10.9 Location and structure of chlorophyll molecules in plants
CO2 + H20  C6H1206 + O2
Sap Flow in Plants
1.
2.
3.
4.
5.
basic root structure
water flow through the cortex cells
the endodermis as a border crossing
water flow in the xylem
the fate of water in the leaf
—photosynthesis
—transpiration
—stomate function
6. sap flow and maple syrup
Figure 36.10 The generation of transpirational pull in a leaf
Figure 36.14 The generation of transpirational pull in a leaf
Figure 36.14 The generation of transpirational pull in a leaf
Figure 36.11 Ascent of water in a tree
Sap Flow in Plants
1.
2.
3.
4.
5.
basic root structure
water flow through the cortex cells
the endodermis as a border crossing
water flow in the xylem
the fate of water in the leaf
—photosynthesis
—transpiration
—stomate function
6. sap flow and maple syrup
STEPS IN STOMATE OPENING
1. Sun comes up.
2. Photosynthesis depletes CO2, stimulating proton pump enzymes.
3. Proton pump enzyme turns on. H+ moved out of guard cells by
active transport (ATP is used).
4. K+ diffuses into cells via K+ channel enzymes.
5. Water diffuses in to balance its concentration relative to K+
6. Guard cells swell and change shape.
Figure 36.2 A chemiosmotic model of solute transport in plant cells
Figure 36.13a The mechanism of stomatal opening and closing
Figure 36.13b The mechanism of stomatal opening and closing
STEPS IN STOMATE OPENING
1. Sun comes up.
2. Photosynthesis depletes CO2, stimulating proton pump enzymes.
3. Proton pump enzyme turns on. H+ moved out of guard cells by
active transport.
4. K+ diffuses into cells via K+ channel enzymes.
5. Water diffuses in to balance its concentration relative to K+
6. Guard cells swell and change shape.
Sap Flow in Plants
1.
2.
3.
4.
5.
basic root structure
water flow through the cortex cells
the endodermis as a border crossing
water flow in the xylem
the fate of water in the leaf
—photosynthesis
—transpiration
—stomate function
6. sap flow and maple syrup
Maple sap is collected from the xylem in wood before leaves appear.
Link to treemet
The osmotic theory of
sap flow invokes the
involvement of living
cells and sucrose to
generate an osmotic
pressure difference
between fibers and
vessels, which are
proposed to be
separated by an
osmotic barrier.
The secondary cell
wall is an effective
osmotic barrier for
large molecules