Calvin cycle is the sequence of photosynthetic in which ribulose-5-phosphate is carboxylated, converted to three-carbon carbohydrate precursors and regenerated. It is also called the reductive pentose phosphate cycle. The reaction of Calvin cycle may be summed up as:
6CO2+18ATP+12NADPH+12H+ Enzymes of dark reaction 6RuBP+C6H12O6+18ADP+12Π+12NADP++6H2O