Developmental Changes in Acyl-Composition of Soybean Seed Selected for High Oleic Acid Concentration
1984
Carver, Brett F. | Wilson, Richard F. | Burton, Joseph W.
Recurrent selection methodology has been utilized in the development of a soybean [Glycine max (L.) Merr.] genotype, designated as N78-2245, that contains a high concentration of oleic acid (18:1) and lower concentrations of linoleic (18:2) and linolenic (18:3) acids compared to seed from typical soybean cultivars. The nature of fatty acid metabolism and deposition during the ontogeny of soybean seed with the high-18:l trait has not been shown previously. The objective of this study was to determine how expression of the high-18:l trait affected lipid composition during seed development. To achieve that objective fatty acid synthesis and composition were evaluated in seed of N78-2245 and ‘Dare’, a typical soybean cultivar, at 15-day intervals during reproductive growth. In N78-2245 seed the greatest amount of 18:1 accumulateduring the period from 30 to 45 days after flowering. The amount of 18:1 deposited in that period was three-times greater than that deposited in Dare. In the intervals after 45 days after flowering, 18:1 deposition declined in N78-2245 seed with a concommitant increase in 18:2 and 18:3. The abrupt shift in net accumulation of 18:1 and 18:2 plus 18:3 during N78-2245 seed ontogeny was attributed to developmental rather than environmental causes. These data have shown that late developmental increases in 18:2 and 18:3 deposition significantly affected the total unsaturated fatty acid composition of mature N78-2245 seed.
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