1. You Try!
With your group, draw the stages of Photosynthesis, adding as much detail as you can without consulting your notes/text.

2. Photorespiration generates no ATP, NADPH, or glucose!
Photorespiration is a major limiting factor in the production levels of
C3 PLANTS
Photorespiration generates no ATP, NADPH, or glucose!
Rice
Up to 50% of the yield of many important agricultural crops like rice, soybeans, and wheat may be lost to photorespiration.
Soybeans

3. Alternate Strategy #1: the C4 PATHWAY
Carbon fixation and the Calvin Cycle
are separated. Fixation occurs in the
MESOPHYLL CELLS
while the Calvin Cycle occurs in the
BUNDLE-SHEATH CELLS.
corn
This separation allows the plants to minimize photorespiration and
maximize sugar production.
sugarcane

4. Results in a SPATIAL SEPARATION of CO2 acquisition and fixation!
An Overview of the C4 Pathway:
Results in a SPATIAL SEPARATION of CO2 acquisition and fixation!

5. Alternate Strategy #2: CAM
CAM plants open their STOMATA at night to acquire CO2. This CO2 is used during the day for fixation in the Calvin Cycle. (Temporal separation!)

6. C4 and CAM Strategies Summarized:

7. Final Key Point: Metabolic Processes are Connected!
During periods of light, which cycle must be faster, the Calvin Cycle or the Citric Acid Cycle? Why??