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Sorghum Kernel Weight

Growth Patterns from Different Positions within the Panicle

^a Cátedra de Cerealicultura, Dep. de Producción Vegetal, Fac. de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453, Capital Federal (C1417DSE), Argentina
^b Current address, Pioneer Hi-Bred Int., 18285 County Road 96, Woodland, CA 95695-9340

View larger version (31K): [in this window] [in a new window]   Fig. 1. Cumulative frequency of plants reaching apical (closed symbols) and basal (open symbols) panicle anthesis from the eight genotypes tested in the present work. Bars represent the SE of the mean of three replicates of 30 plants each.

View larger version (19K): [in this window] [in a new window]   Fig. 2. Relationship between mean final kernel weight and kernel growth rate (A) and total duration of grain filling (B) for the eight genotypes tested.

View larger version (20K): [in this window] [in a new window]   Fig. 3. Relationship between final kernel weight (A), kernel growth rate (B), and duration of the grain-filling period (C) and maximum water content in apical (closed symbols) and basal (open symbols) kernel positions within the sorghum panicle, for all the genotypes tested. Final kernel weight was calculated by a trilinear with plateau model, and maximum water content was determined as the maximum value measured in each genotype x position combination.

View larger version (27K): [in this window] [in a new window]   Fig. 4. (A) Relative final kernel weight, (B) relative maximum water content, (C) relative maximum kernel volume, and (D) kernel moisture in apical (closed symbols) and basal (open symbols) kernel positions within the panicle for all the sorghum genotypes evaluated. In 4D, bars represent the SE of the mean of three replicates.

View larger version (18K): [in this window] [in a new window]   Fig. 5. Relationship between the total duration of the grain-filling period and kernel moisture content at physiological maturity (PM) in apical (closed symbols) and basal (open symbols) kernel positions within the panicle for all the genotypes tested.

View larger version (24K): [in this window] [in a new window]   Fig. 6. Relationship between relative maximum kernel weight (A), relative maximum water content (B), and relative maximum kernel volume (C) with moisture content during grain filling in apical (closed symbols) and basal (open symbols) kernel positions within the panicle for all the genotypes evaluated.

View larger version (22K): [in this window] [in a new window]   Fig. 7. Relationship between kernel density and moisture content during grain filling in apical (closed symbols) and basal (open symbols) kernel positions within the panicle for all the genotypes tested. Kernel density was calculated as kernel dry weight (mg kernel–1) divided by kernel volume (µL kernel–1).