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Grain Position Affects Grain Macronutrient and Micronutrient Concentrations in Wheat

^a Dep. Producción Vegetal, Facultad de Agronomía, Univ. de Buenos Aires, Argentina
^b CIMMYT (International Maize and Wheat Improvement Center), Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico

View larger version (17K): [in a new window]   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.

View larger version (33K): [in a new window]   Fig. 2. Water (W), Ca, Mg, K, P, and S concentrations in developing grains of ‘Bacanora T88’, ‘Rayón F89’, and the Synthetic. Samples were from the second sowing date. G1, G2, G3, G4 indicate grain positions within the CS, G1 is the grain position closest to the rachis. Values in parentheses indicate relative differences (%) between grain positions G3 or G4 (depending on genotype) and G1 averaged across all sampling dates.

View larger version (35K): [in a new window]   Fig. 3. Copper, Fe, Mn, and Zn concentrations in developing grains of ‘Bacanora T88’, ‘Rayón F89’, and the synthetic line. Samples were from the second sowing date. G1, G2, G3, G4 indicate grain positions within the CS, G1 is the grain position closest to the rachis. Values in parentheses indicate relative differences (%) between grain positions G3 or G4 (depending on genotype) and G1 averaged across all sampling dates.