Photosynthesis Making Organic Molecules. Overview.

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Presentation transcript:

Photosynthesis Making Organic Molecules

Overview

Light-Dependent Reactions Absorption of Light by Chlorophyll

Light-Dependent Reactions

Non-Cyclic Electron Transport

Cyclic Electron Transport Light-Dependent Reactions

Light Independent Reactions Calvin Cycle Calvin-Benson Cycle Dark Reactions

Light Independent Reactions RuBP Carboxylase PGA

“C-3 Plants” Calvin Cycle results in 3-carbon PGA. Problem: Photorespiration –When CO 2 levels are low… –O 2 combines with RuBP instead of CO 2 –Product splits, and breaks apart, releasing CO 2 and NO ATP! –Inefficient – less sugar…less energy! Little PGA is produced – the precurser to sugar.

Solution?... Alternate Pathways for CO 2 fixation have evolved! C-4 plants –Carbon fixation results in a 4-carbon molecule: Oxaloacetate (OAA). –C-4 pathway in mesophyll cells, Calvin Cycle in bundle-sheath cells. CAM plants –Crassulacean Acid Metabolism –C-4 pathway by night, Calvin Cycle by day

C-4 plants & CAM plants

Alternate pathways for CO 2 fixation! Read pp

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