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Response of Low Seed Phytic Acid Soybeans to Increases in External Phosphorus Supply

^a USDA-ARS and Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27695
^b USDA-ARS, 3127 Ligon St., Raleigh, NC 27607
^c USDA-ARS, 232 National Soybean Research Center, 1101 W. Peabody Dr., Urbana, IL 61801

View larger version (17K): [in this window] [in a new window]   Figure 1. Influence of P supply on seed P composition of normal and low phytic acid soybeans (Experiment 1). LSD0.05 values for comparison of any two treatment means are 0.42, 0.32, and 0.37 for phytic acid P, inorganic P, and total P concentrations, respectively, as P level x genotype interactions were significant. Genotype and P level main effects on cellular P concentration were also significant at the 0.0001 probability level.

View larger version (16K): [in this window] [in a new window]   Figure 2. Impact of P supply on total P concentrations in leaves and seed of soybean genotypes with normal and low seed phytic acid P concentrations (Experiment 1). Bars represent standard deviations.

View larger version (28K): [in this window] [in a new window]   Figure 3. Impact of external P supply on seed P composition of a soybean genotype with no low phytic acid alleles (Prichard RR) and of genotypes with either low phytic acid alleles on linkage group L (LG L), or low phytic acid alleles on linkage group N (LG N) or low phytic acid alleles on both LG L and LG N (G03PHY-443) (Experiment 2). LSD0.05 values for comparison of any two treatment means are 0.56 and 0.22 for phytic acid P and inorganic P concentrations, respectively, as the P level x genotype interactions were significant at the 0.05 probability level. The genotype main effect for cellular P concentration and the P level main effect for total P concentration were significant at the 0.0001 probability level.

View larger version (14K): [in this window] [in a new window]   Figure 4. Effect of external P supply on seed inorganic P concentration of a genotype with no low phytic acid alleles (Prichard-RR) compared to response in lines with low phytic acid alleles at a locus on linkage group L (LG L) or at a locus on linkage group N (LG N) (Experiment 2). The LSD0.05 for comparison of any two treatment means is 0.22.