C3 Plant

C3 Plant The beginning of this orange plant is an example of a C3 Plant. Plants in which the Calvin cycle uses CO2 directly from the air are called C3 plants because the first organic compound produced is the 3 carbon compound 3-PGA, unlike C4 and CAM plants that produce the 4 carbon molecule 4-C. C3 plants are the most common and widely distributed plants in agriculture. A disadvantage of C3 plants is photorespiration, which is the result of dry and hot weather and the lack of CO2 due to closing stomata. In photorespiration, there is a lack of CO2 and an abundance of O2, so the enzyme rubisco adds O2 instead of CO2 to RuBP resulting in a useless two carbon product that must be broken down.

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