Figure 6.

Season-long differences in the midday quantum efficiency of CO₂ assimilation (ΔΦ_CO2) between Y11y11 soybean mutants (Y11y11) and wild type across the vertical profile of the canopies (height above ground normalized by canopy height, z/h) for the 2013 growing season. Color map shows the difference between Y11y11 and wild-type canopies (Y11y11, wild-type values) at each of the canopy regions above ground normalized by the canopy height (z/h). Positive values (more red) represent regions of the canopy where Y11y11 has a larger value than wild type, and more blue values are regions where the wild-type values are higher. Simulations were performed assuming the genotype-specific Chl content and Y11y11 values for (A) LAI and constant photosynthetic biochemical capacity (V_cmax and J_max), (B) wild-type LAI and biochemical capacity scaled with Chl, (C) wild-type LAI and a constant photosynthetic biochemical capacity, and (d) Y11y11 values for LAI and biochemical capacity scaled with Chl. Environmental forcing (precipitation, downwelling radiation, temperature, H₂O vapor pressure, and wind speed) for the simulations were taken from the 2013 growing-season. WT, wild type.