Elevated Palmitate and Stearate Concentrations in the Oil of Low-Phytate Soybean Lines
The combination of low phytate (LP) and low saturated fatty esters in a soybean [Glycine max (L.) Merr.] cultivar could improve the availability of inorganic phosphorus (Pi) in livestock rations and improve the nutrition of the oil used in human diets. Previous studies indicated that lines with the lpa1 and lpa2 alleles for LP and the fap1(C1726) and fap3(A22) alleles for reduced palmitate had greater palmitate plus stearate (saturate) concentrations than normal-phytate (NP) lines. The objective of our study was to evaluate possible causes of the association between LP and saturate concentration. Low-phytate and NP F3 individuals and their progeny were evaluated from three single-cross populations segregating for Lpa1, lpa1, Lpa2, and lpa2 and homozygous for fap1(C1726) and fap3(A22). The mean palmitate, stearate, and saturate concentrations of the LP lines were significantly greater than the NP lines in all the populations. The frequency of F3:4 lines with a saturate concentration of ≤70 g kg−1 averaged across populations was 8% for the LP lines and 74% for the NP lines. The elevated saturates was not attributable to genetic factors linked to lpa1 or lpa2 but was associated with a greater concentration of Pi in LP individuals. The apparent relationship between elevated Pi and elevated saturate concentrations would hinder the development of LP cultivars with low saturated fatty esters.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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