ENVS 3010 Chapter Notes - Chapter 4: Carbanion, Malic Acid, Phenology
21 Jul 2016
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Document Summary
The impacts of climate change are first experienced at the level of the physiology of the individual organism: these impacts combine, amplify, dampen and generally interact as they ripple up food chains, across communities, and through ecosystems. Virtually all carbon fixed by photosynthesis is the result of one enzyme, rubisco. There are 3 pathways for photosynthesis: they differ in how the primary uptake of co2 is achieved. These differences are fundamental to understanding some plant responses to climate change. C3 photosynthesis: 95% of plants are known as c3 plants, they assimilate co2 directly via the calvin cycle, co2 uptake is catalyzed directly via rubisco. Oxygenation of the rubp (photorespiration: only the carboxylated molecules can be turned into sugar, a higher ration of co2 to o2 leads to higher rates of photosynthesis. C4 photosynthesis: 3% of plants use c4 photosynthesis, c4 plants come in 3 different types, primary uptake of co2 is catalyzed by pep carboxylase.
