Fig. 1. The concentration of macronutrients (Ca, Mg, K, P and S) in wheat grain at grain positions G₂, G₃ and G₄ of central spikelets. Data are presented relative to G₁ concentrations in ‘Bacanora T88’, ‘Rayón F89’, and the synthetic line. Closed symbols indicate significant (P < 0.05) differences from G₁.