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. 1977 Nov;60(5):739–742. doi: 10.1104/pp.60.5.739

Ammonia Regulation of Carbon Metabolism in Photosynthesizing Leaf Discs 1

Steven G Platt a,2, Zvi Plaut b,3, James A Bassham b
PMCID: PMC542705  PMID: 16660175

Abstract

Alfalfa (Medicago sativa L., var. El Unico) leaf discs, floating on buffer containing NH4Cl and photosynthesizing with 14CO2, produced more labeled amino acid and less sucrose than did control discs (no added NH4Cl). The level of pyruvate increased and that of phosphoenolpyruvate decreased. These and other changes in levels of labeled compounds led us to conclude that pyruvate kinase was activated by ammonia, resulting in increased transfer of photosynthetically incorporated carbon to synthesis of amino acid skeletons at the expense of sucrose synthesis. Carbon flow through enzymes catalyzing the anaplerotic reactions was apparently stimulated.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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