Figure 5. Mechanistic interaction between C₂ and C₄ cycle.

(A) Predicted fluxes when the model is parameterized to include activity of the C₄ cycle enzymes. Fluxes are given in µmol s⁻¹ m⁻². Values in brackets show minimum and maximum of flux resulting from flux variability analysis. The sum of absolute flux over plasmodesmata was 21.9 µmol s⁻¹ m⁻². Flux of dissolved gasses, sucrose, inorganic compounds and processes that carry flux below 1 µmol s⁻¹ m⁻² are not shown. See Figure 5—source data 1 for plasmodesmatal fluxes. (B) Predicted activities of Ala-AT in mesophyll (black line) and bundle sheath (gray line) cells and predicted transfer of α-ketoglutarate from mesophyll to bundle sheath cells (black dashed line) and glutamate from bundle sheath to mesophyll cells (gray dashed line) at low C₄ cycle activities. (C) Changes in biomass production with varying (low) activity of the C₄ cycle in a C₂ plant.

DOI: http://dx.doi.org/10.7554/eLife.02478.014