Alternatives in carbon fixation Page

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Presentation transcript:

Alternatives in carbon fixation Page 231-234 Photosynthesis Alternatives in carbon fixation Page 231-234

Problem with rubisco RuBisCO Is a carboxylase and an oxygenase Can incorporate a carbon dioxide or an oxygen to RuBP Problem with rubisco

Problem with rubisco

Photorespiration Incorporating oxygen into RuBP Why does the plant do this? Photorespiration

Rubisco Enzyme binds CO2 about 80x faster than it binds O2 Under normal atmospheric conditions, the Calvin cycle will occur 75% and photorespiration occurs 25% of the time Rubisco

Stomata: Microscopic pores Leaf structure

Know the roles of: Bundle sheath cell Mesophyll cell C4 plants

C4 Plants

Many tropical plants Also crops like sugar and corn C4 plants

Mainly plants that live in hot and arid conditions CAM plants

CAM Plants