Figure 7.

Grain yield and N use parameters at maturity of two HvGS1‐1 cisgenic lines (T3, 2.2 and 4.5) and wild‐type growing under ambient (400 μL/L) or elevated (800 μL/L) atmospheric CO₂. (a) Grain yield, (b) straw yield (shoot biomass without grain) (c) grain protein concentration, (d) straw N concentration, (e) total shoot N, (f) thousand kernel weight, (g) nitrogen utilization efficiency (NUE) and (h) nitrogen harvest index (NHI) of plants grown with medium (0.45 g N/L soil) N supply. Data are presented as means ± SE (n = 9). Different letters above bars indicate significant difference (P < 0.05, Fischer LSD) between genotypes under different CO₂ treatment.