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C3-plante

Calvin-cyklus.

C3-carbon fiksering er en stofskiftevej for carbon-fiksering i fotosyntese. Denne proces konverterer carbondioxid og ribulose bisphosphate (RuBP, a 5-carbon sukker) om til 3-phosphoglycerate gennem følgende reaktion:

6 CO2 + 6 RuBP → 12 3-phosphoglycerate

Planter som alene overlever ved C3 fiksering (C3-planter) trives for det meste i områder med moderat sollysintensitet, moderate temperaturer, carbondioxid koncentrationerne er omkring 200 ppm eller højere og med rigeligt grundvand. C3-planterne dukkede op under æraene Palæozoikum og Mesozoikum – og dukkede dermed op før C4-planterne og C3-planterne udgør stadig omkring 95% af jordens planters biomasse.

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C3-plante
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