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Insights into Light Reactions and Photosynthesis in Higher Plants

Explore electron carriers and proton movement in light reactions of plants, ATP generation, photorespiration, xerophytic plants adaptations, C4 photosynthesis benefits, and the origin of photosynthetic organisms. Discover the fascinating world of plant biology.

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Insights into Light Reactions and Photosynthesis in Higher Plants

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  1. Light reactions in higher plants-electron carriers and proton movement, which makes ATP-sound familiar? 16-42, 658

  2. Photorespiration- Competing against photosynthesis-liberates CO2 instead of fixing it into a 3-carbon molecule- All Rubisco’s do it 16-50, 668

  3. Xerophytic plants- (can withstand hot, dry conditions) have modification that allows concentration of CO2 Normally hot weather causes plants to close stomata, which lowers internal [CO2], which favors photorespiration because of Km of RUBISCO 16-51, 668

  4. C4 photosynthesis called C4 because it starts with 4 carbon molecules, instead of ‘regular’ photosynthesis which starts with 3 carbon molecules (at least, those are among the first isolated) 16-52, 669

  5. As much as 50% of CO2 fixed by rubisco is reoxidized to CO2 by photorespiration in C3 plants -high O2 concentration in atmosphere C4 plants phosphoenolpyruvate carboxylase has higher affinity (lower Km) for CO2 than does rubisco- result can be 2-3 fold greater photosynthetic production in C4 plants than in C3 plants 16-48, 665 catalytic domain of RUBISCO

  6. What was first photosynthetic organism? Carl Bauer’s lab, Indiana Univ.-looked at >100 genes involved in photosynthesis, then did phylogenetic analysis to find out which most ancient. Purple bacteria probably first group of organisms that were photosynthetic, not green algae.

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