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Mechanism of C4 photosynthesis in Chloris gayana: pool sizes and kinetics of 14CO2 incorporation into 4-carbon and 3-carbon intermediates



Mechanism of C4 photosynthesis in Chloris gayana: pool sizes and kinetics of 14CO2 incorporation into 4-carbon and 3-carbon intermediates



Archives of Biochemistry and Biophysics 194(1): 117-127



Studies of detached leaves of C. gayana exposed to 14CO2, indicated photosynthetically active pools of 0.45 mu mol/mg aspartate, 0.22 mu mol malate and 0.95 mu mol 3-phosphoglycerate. The total pools of aspartate and 3-phosphoglycerate were of similar size to the photosynthetically active pools, but that of malate was 100 times greater than the photosynthetically active pool. Labelling of alanine was consistent with its derivation from C atoms 1, 2 and 3 of aspartate. The alanine pool was about 8 times larger than the phosphoenol pyruvate pool.

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Accession: 000696385

Download citation: RISBibTeXText

PMID: 443796

DOI: 10.1016/0003-9861(79)90601-5


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