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Maize Kernel Composition and Post-Flowering Source-Sink Ratio

^a Dep. de Producción Vegetal, Fac. de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453, Capital Federal (C1417DSE), Argentina
^b Dep. de Biología Aplicada y Alimentos, Fac. de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453, Capital Federal (C1417DSE), Argentina

View larger version (30K): [in a new window]   Fig. 1. Starch (A), protein (B) and oil (C) yield per plant for varying KNP values of hybrids DK664 and DK752 grown at the stand densities of 3 (LD) and 9 (HD) plants m-2. Parameters ± standard errors of the fitted linear and bilinear models are shown in the inserts of each figure with the corresponding symbols.

View larger version (31K): [in a new window]   Fig. 2. Starch (A), protein (B) and oil (C) content per kernel (mg kernel-1) in relation to kernel weight (KW; mg kernel-1) for hybrids DK664 and DK752. The gray dotted lines within each graphic show the concentration of the component as reference. Inserts within each figure show the parameters ± the standard error of the fitted linear and bilinear models.

View larger version (37K): [in a new window]   Fig. 3. Normalized protein, starch and oil variations in response to the post-flowering source-sink ratio of hybrids DK664 and DK752. Model parameters ± standard errors are shown in the insert. The post-flowering source-sink ratio was calculated as plant biomass increase per kernel during the effective grain-filling period (mg kernel-1).

View larger version (35K): [in a new window]   Fig. 4. Response of starch, protein and oil concentration to variations in the post-flowering source-sink ratio of hybrids DK752 and DK664. Model parameters ± standard errors are shown in the insert. The post-flowering source-sink ratio was calculated as plant biomass increase per kernel during the effective grain-filling period (mg kernel-1).

View larger version (22K): [in a new window]   Fig. 5. Residual stem N and soluble nonstructural carbohydrates (SNC) (mg kernel-1) at physiological maturity (PM) of hybrids DK664 and DK752 in response to the post-flowering source-sink ratio. Model parameters ± standard errors are shown in the insert. The post-flowering source-sink ratio was calculated as plant biomass increase per kernel during the effective grain-filling period (mg kernel-1).