Fatty acid development in a soybean mutant with high stearic acid

Abstract

The fatty acid composition of developing soybean (Glycine max [L.] Merrill) seeds was evaluated in the mutant line, A6, and its parent, FA8077. Seeds of both lines were harvested at 2‐day intervals from 15 to 39 days after flowering (DAF) and at 4‐day intervals from 39 DAF until maturity. Significant differences between the two lines were observed for stearic and oleic acid percentages at 19 DAF. The maximum difference between the lines was at 25 DAF, when A6 had 45.4% and FA8077 had 4.1% stearic acid. The increase in stearic acid percentage in A6 was accompanied by a decrease in oleic acid to 16.8% at 25 DAF, compared with 53.7% oleic acid for FA8077. The two lines did not differ in development of palmitic, linoleic and linolenic acids. The protein and oil content of mature seeds were similar for the two lines.

Fractionation of soybean phospholipids by high‐performance liquid chromatography with an evaporative light‐scattering detector

“…These results may be partially explained by the noncoincidence of the peak biosynthesis of different fatty acids during maturation of the beans. Thus, at different seed developmental stages, the relative availability of various fatty acyl groups for PL synthesis may be different (30,31). Such a hypothesis was invoked to account for discrepancies between the determined and the calculated triglyceride molecular fractions (26).…”

Effect of sulphur supplementation on micronutrients, fatty acids and sulphur use efficiency of soybean seeds

“…Differences in the composition of fatty acid in seed oil can be due to environmental conditions also (Boschin et al, 2007). Fatty acid composition of soybean oil changes considerably with maturity along with seed oil deposition (Graef et al, 1985, Ishikawa et al 2001. Triacylglycerols, palmitic acid, linolenic acid tend to decrease with maturity whereas linoleic acid increases.…”

Mapping the Fas locus controlling stearic acid content in soybean

“…Nearly all the variants currently known have been induced by chemical or X-ray mutagenesis. Five soybean germplasm lines are reported to carry modified stearic acid alleles: fas a [A6, (Hammond and Fehr 1983)], fas b [FA41545 (Graef et al 1985a)], fas [A81-606085, (Graef et al 1985b)], st1 [KK-2 (Rahman et al 1997)] or st2 [M25, (Rahman et al 1997)]. As reported by Graef et al (1985b), fas a (30% stearic acid), fas b (15% stearic acid) and fas (19% stearic acid) are allelic and represent different mutations in the same gene.…”