Summary
Sugars and amino acids fuel plant growth, development and biomass production. They are required in different amounts and stoichiometries according to developmental stage and environmental challenges and constraints. Extensive interdependence of C and N assimilation operates at several levels, necessitating a complex array of reciprocal controls. Export of amino acids occurs in response to active loading and transport of sucrose in the phloem. Sucrose is the currency of energy exchange between organs and provides ATP for transport processes. Coordination of C and N flow into amino acids and carbohydrates is achieved by regulation of crucial enzyme activities. Nitrate reductase (NR), phosphoenolpyruvate carboxylase (PEPC) and sucrose phosphate synthase (SPS) are key enzymes in N assimilation, anaplerotic C flow and sucrose synthesis, respectively. Their activities are coordinated by several mechanisms, the most important of which is protein phosphorylation. Intermediates and products of these pathways regulate gene expression, thereby transmitting information on metabolism to orchestrate C/N flow. A number of putative signal metabolites have been characterized. N metabolites are required for synthesis and activation of enzymes involved in C metabolism (especially for PEPC and SPS). C metabolites are necessary for the synthesis and activation of enzymes catalyzing the assimilation of N (for example, sugars promote NR gene expression). The ‘signals’ involved include nitrate per se, as well as intermediates and products of C and N assimilation such as amino acids, organic acids and sugars.
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Abbreviations
- ADPGlc PPase:
-
ADPglucosepyrophosphorylase
- C:
-
carbon
- CAM:
-
Crassulacean acid metabolism
- CaMV:
-
cauliflower mosaic virus
- CHX:
-
cycohexamide
- cIDH:
-
cytosolic isocitrate dehydrogenase
- CoA:
-
coenzyme A
- DHAP:
-
dihydroxyacetone phosphate
- FC:
-
fusicoccin
- Fd:
-
ferredoxin
- FNR:
-
ferredoxin NADP reductase
- G6PDH:
-
glucose 6-phosphate dehydrogenase
- GDH:
-
glutamate dehydrogenase
- Glc 6-P:
-
glucose 6-phosphate
- GOGAT:
-
glutamate synthase
- GS:
-
glutamine synthetase
- N:
-
nitrogen
- NiR:
-
nitrate reductase
- NR:
-
nitrate reductase
- 2-OG:
-
2-oxoglutarate
- OAA:
-
oxaloacetate
- PEP:
-
phosphoenolpyruvate
- PEPC:
-
phosphoenolpyruvate carboxylase
- PGA:
-
3 phosphoglycerate
- Pi:
-
inorganic phosphate
- PK:
-
protein kinase
- PM-NR:
-
plasmamembrane bound nitrate reductase
- PP:
-
protein phosphatase
- rbcS:
-
ribulose 1,5-bisphosphate carboxylase oxygenase small subunit
- RPPP:
-
reductive pentose phosphate pathway
- Ru5P:
-
ribulose 5 phosphate
- RubP:
-
ribulose 1,5 bisphosphate
- SPS:
-
sucrose phosphate synthase
- Susy:
-
sucrose synthase
- TCA:
-
tricarboxylic acid
- TP:
-
triose phosphate
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Foyer, C.H., Ferrario-Méry, S., Huber, S.C. (2000). Regulation of Carbon Fluxes in the Cytosol: Coordination of Sucrose Synthesis, Nitrate Reduction and Organic Acid and Amino Acid Biosynthesis. In: Leegood, R.C., Sharkey, T.D., von Caemmerer, S. (eds) Photosynthesis. Advances in Photosynthesis and Respiration, vol 9. Springer, Dordrecht. https://doi.org/10.1007/0-306-48137-5_8
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