A generalized stoichiometric model of C₃, C₂, C₂+C₄, and C₄ photosynthetic metabolism

A generalized stoichiometric model of C₃, C₂, C₂+C₄, and C₄ photosynthetic metabolism

The goal of suppressing photorespiration in crops to maximize assimilation and yield is stimulating considerable interest among researchers looking to bioengineer carbon-concentrating mechanisms into C₃ plants. However, detailed quantification of the biochemical activities in the bundle sheath is la...

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Veröffentlicht in:Journal of Experimental Botany. - Oxford University Press. - 68(2017), 2, Seite 269-282
1. Verfasser: Bellasio, Chandra (VerfasserIn)
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Journal of Experimental Botany
Schlagworte:Assimilation bioengineering carbon-concentrating mechanism constraint dark reactions flux balance flux-balance analysis NAD-ME NADP-ME PEPCK
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245 1 2 |a A generalized stoichiometric model of C₃, C₂, C₂+C₄, and C₄ photosynthetic metabolism 
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520 |a The goal of suppressing photorespiration in crops to maximize assimilation and yield is stimulating considerable interest among researchers looking to bioengineer carbon-concentrating mechanisms into C₃ plants. However, detailed quantification of the biochemical activities in the bundle sheath is lacking. This work presents a general stoichiometric model for C₃, C₂, C₂+C₄, and C₄ assimilation (SMA) in which energetics, metabolite traffic, and the different decarboxylating enzymes (NAD-dependent malic enzyme, NADP-dependent malic enzyme, or phosphoenolpyruvate carboxykinase) are explicitly included. The SMA can be used to refine experimental data analysis or formulate hypothetical scenarios, and is coded in a freely available Microsoft Excel workbook. The theoretical underpinnings and general model behaviour are analysed with a range of simulations, including (i) an analysis of C₃, C₂, C₂+C₄, and C₄ in operational conditions; (ii) manipulating photorespiration in a C₃ plant; (iii) progressively upregulating a C₂ shuttle in C₃ photosynthesis; (iv) progressively upregulating a C₄ cycle in C₂ photosynthesis; and (v) manipulating processes that are hypothesized to respond to transient environmental inputs. Results quantify the functional trade-offs, such as the electron transport needed to meet ATP/NADPH demand, as well as metabolite traffic, inherent to different subtypes. The SMA refines our understanding of the stoichiometry of photosynthesis, which is of paramount importance for basic and applied research. 
540 |a © The Author 2016 
650 4 |a Assimilation 
650 4 |a bioengineering 
650 4 |a carbon-concentrating mechanism 
650 4 |a constraint 
650 4 |a dark reactions 
650 4 |a flux balance 
650 4 |a flux-balance analysis 
650 4 |a NAD-ME 
650 4 |a NADP-ME 
650 4 |a PEPCK 
655 4 |a research-article 
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