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Photosynthesis in Cyanobacteria and chloroplasts PowerPoint Presentation
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Photosynthesis in Cyanobacteria and chloroplasts

Photosynthesis in Cyanobacteria and chloroplasts

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Photosynthesis in Cyanobacteria and chloroplasts

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    1. Photosynthesis in Cyanobacteria and chloroplasts Macro-evolution to enhance efficiency and overcome stressors

    2. Review Photosynthetic pigments thought to originally have evolved to protect against UV radiation (like your skin pigments) 5 types of bacteria + 1 archaea use light energy for some part of metabolism Only cyanobacteria are oxygenic (chloroplasts derived from them) Prototype Reaction Center performed both functions: generate ATP to power metabolism Reduce NADH+ to NADPH for use in C fixation (electron carrier) Solutions to low efficiency of intermediate-type reaction center: RC Type 2: Purple (sulfur and non-sulfur) and filamentous green bacteria have a reaction center that uses cyclic electron flow to synthesize ATP RC Type 1: Green sulfur bacteria and Heliobacteria have a reaction center that uses non-cyclic electron flow to synthesize NADPH Linked Photosystems: Cyanobacteria have 2 different types of reaction centers linked together PS II: similar to RC 2 but instead of recycling e-, passes it to PS I PS I: similar to RC 1