Abstract
The white-3 (w3) mutant of corn which lacks carotenoids is capable of a low rate of light-stimulated CO2 fixation in dim red light. Bright light inhibits CO2 fixation. The products of CO2 fixation indicate that w3 lacks a normal Calvin cycle, but fixes carbon by carboxylation reactions that lead to the production of several organic acids. These reactions appear not to be related to the C4 photosynthetic cycle. In addition, the w3 mutant does not make amino acids from photosynthetic carbon.
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