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Buy Wholesale and maintain an Active status for 2 months and we will refund your $39 Distributor Fee
11-SEPTEMBER-2008 13:54:10 - C3 carbon fixation Calvin cycle Calvin cycle C3 carbon fixation is a metabolic pathway for carbon fixation in photosynthesis. This process converts carbon dioxide and ribulose bisphosphate RuBP, a 5-carbon sugar into 3-phosphoglycerate through the following reaction: 6 CO2 + 6 RuBP → 12 3-phosphoglycerate This reaction occurs in all plants as the first step of the Calvin cycle. In C4 plants, carbon dioxide is drawn out of malate and into this reaction rather than directly from the air. Plants that survive solely on C3 fixation C3 plants tend to thrive in areas where sunlight intensity is moderate, temperatures are moderate, carbon dioxide concentrations are around 200 ppm or higher, and ground water is plentiful. The C3 plants, originating during Mesozoic and Paleozoic era, predate the C4 plants and still represent approximately 95% of Earth's plant biomass. C3 plants lose 97% of the water taken up through their roots to transpiration.1 C3 plants must be in areas with high concentrations of carbon dioxide because RuBisCO often incorporates an oxygen molecule into the RuBP, instead of a carbon dioxide molecule. This breaks the RuBP into a three-carbon sugar that can remain in the Calvin cycle, and two molecules of glycolate which is oxidized into carbon dioxide, wasting the cell's energy. High concentration of carbon dioxide lowers the chance that RuBisCO incorporates an oxygen molecule. C4 and CAM plants have adaptations that allow them to survive in areas where the plant cannot take in a lot of carbon dioxide. The isotopic signature of C3 plants shows higher degree of 13C depletion than the C4 plants. See also C4 carbon fixation CAM photosynthesis References ^ Raven, J.A.; Edwards, D. 2001. Roots: evolutionary origins and biogeochemical significance. Journal of Experimental Botany 52 90001: 381-401. doi:10.1093/jexbot/52.suppl_1.381 inactive 2008-06-21. Retrieved from http://en..org/wiki/C3_carbon_fixation Categories: PhotosynthesisHidden category: Pages with DOIs broken since 2008 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Dansk Deutsch Esperanto 한국어 Italiano Suomi Svenska Tiếng Việt Türkçe This page was last modified on 26 June 2008, at 23:53
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