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BGSU BIOL 2050 - Dark Reactions

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BIOL 2050 1nd Edition Lecture 16 Outline of Last Lecture I. Photosynthesisa. Processb. PhotosystemsOutline of Current Lecture II. Dark Reactionsa. Alternate Mechanisms for Carbon FixationCurrent LectureDark Reactions (Independent Light Reactions)- The Calvin cycle regenerates its starting material after molecules enter and leave the cell- Builds sugar from smaller molecules by using ATP and the reducing power of electrons carried by NADPH- Calvin Cycleo Carbon enters as CO2 and leaves as G3Po Phases: Carbon fixation Reduction Regeneration of the CO2 acceptor Alternative mechanisms of carbon fixationo On hot and dry days, plants close stomata in order to conserve water but this also limits photosynthesis Reduces access CO2 and causes O2 to build up Photorespiration: rubisco adds O2 instead of CO2 in the Calvin Cycle- Consumes O2 and organic fuel and releases CO2 without producing ATP or sugar- Limits damaging products of light reactions that build up in absences of the calvin cycle.- Problem: can drain up to half of the plants carbon fixed by the Calvin Cycle on hot days.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o C4 Plants: minimize the cost of photorespiration by incorporating CO2 into four-carbon compounds in mesophyll cells Requires PEP carboxylase Ex. Sugar


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BGSU BIOL 2050 - Dark Reactions

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