Alternative pathways in photosynthesis
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Alternative Pathways in Photosynthesis. Figure 10.20 A review of photosynthesis. “C 3 ” Plants. Photosynthesis relies on CO 2 entering the leaf and O 2 leaving the leaf. Leaf surfaces contain stomata. 18 µm. Pore. Stoma. Guard cells. Carbon dioxide diffuses into leaves through stomata.

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C 3 plants l.jpg
“C3” Plants


Photosynthesis relies on co 2 entering the leaf and o 2 leaving the leaf l.jpg
Photosynthesis relies on CO2 entering the leaf and O2 leaving the leaf

Leaf surfaces contain stomata

18 µm

Pore

Stoma

Guard cells


Slide5 l.jpg

Carbon dioxide diffuses into leaves through stomata

H2O

Leaf cross-section

BUT: water also escapes through the stomata

CO2


Slide6 l.jpg

C4 plants sequester CO2 in certain cells

CO2

CO2 stored in mesophyll cell

Organicacid

C4 pathway

CO2

CO2 used inadjacent bundle sheath cell

Calvin cycle

G3P

Examples of C4 plants: corn, sugarcane, many grasses


Figure 10 18 c 4 leaf anatomy and the c 4 pathway l.jpg
Figure 10.18 C4 leaf anatomy and the C4 pathway


C 4 plants l.jpg
C4 Plants


Slide9 l.jpg

CAM plants sequester CO2 at night

CO2

CO2 storedat night

Organicacid

C4 pathway

CO2

Calvincycle

CO2 usedduring the day

G3P

Examples of CAM plants: pineapples, cacti, and most succulents.


Cam plants l.jpg
CAM Plants

Welwitschia


Figure 10 19 c 4 and cam photosynthesis compared l.jpg
Figure 10.19 C4 and CAM photosynthesis compared


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