However, it is still not known whether this reduction in nutrients in grain is regulated through the suppression of nutrient
uptake or transport or by lower allocation to wheat grain at [eCO2]. Further, reduction in grain protein concentration was well correlated with S (r2 = 0.9), Fe (r2 = 0.7) and Zn (r2 = 0.5) suggesting that a decline in grain protein concentration will follow similar reduction of these nutrients.