Figure 4.

Shoot nitrogen (N) content (a) and concentration (b) of wheat (Triticum aestivum L., cv. Avalon, Cadenza, Skyfall) grown at ambient (white boxes) and elevated CO₂ (black boxes). Shoot content (c) and concentration (d) of fungal‐acquired ¹⁵N. Plants were grown at ambient (440 ppm, white boxes) and elevated (800 ppm, grey boxes) CO₂. Bars sharing letters are not significantly different, where p > .05 (ANOVA, Tukey post hoc test). Data were log₁₀ transformed where data assumptions were not met. N.S.D., not significantly different