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Biology

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Photosynthesis

Plant Carbon Fixation in Hot Climates

Description

Plant carbon fixation in hot climates can follow the C4 pathway or the CAM pathway. These alternative pathways help some plants reduce energy loss from photorespiration. Photorespiration happens when oxygen levels are high and rubisco, the enzyme in the Calvin cycle, binds O2 instead of CO2. When that happens, photosynthesis...

Transcript

- [Narrateur] Certaines plantes, comme le maïs,ont mis au point des méthodes alternativespour fixer le carboneplus efficacement dans les environnements chauds et secs. En un, la voie C4. Au cours de la première étape de fixation du carbone,le dioxyde de carbone, le CO2,pénètre dans les cellules mésophileset via l'enzyme PEP carboxylase,se comb...

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