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United States Department of Agriculture

Agricultural Research Service

Title: Second-Year Study on the Inheritance of the Reduced Saturated Fatty Acid Trait in Sunflower Seed

Authors
item Vick, Brady
item Jan, Chao-Chien
item Miller, Jerry

Submitted to: Proceedings Sunflower Research Workshop
Publication Type: Proceedings
Publication Acceptance Date: March 15, 2004
Publication Date: March 15, 2004
Citation: Vick, B.A., Jan, C.C., Miller, J.F. 2004. Second-year study on the inheritance of the reduced saturated fatty acid trait in sunflower seed. Proceedings Sunflower Research Workshop. Available: http://www.sunflowernsa.com/research/research-workshop/documents/145.pdf

Interpretive Summary: In 2003 we reported the results of our first-year study on the inheritance of the reduced saturated fatty acid trait of two germplasm lines, RS1 and RS2, which were released in 2001. This year we report the results obtained from the second-year field study. We studied the inheritance of palmitic and stearic acids, the two predominant saturated fatty acids of sunflower seed oil. In a practical sense, the expression of the reduced palmitic and stearic acid traits is most important in the second generation of a hybrid cross (F2 seed) because it is the F2 seed that is harvested by the farmer, sold, and crushed for the oil. Our experiments showed that the F2 seed was intermediate between the two hybrid parents in saturated fatty acid content, and that the inheritance and expression of the reduced palmitic and stearic acid traits of RS1 and RS2 were complex and determined by more than one gene. In addition, there were significant relative changes in palmitic and stearic acid contents between the two growing seasons, suggesting that environmental conditions play a significant role in the relative proportions of palmitic and stearic acids. The total saturated fatty acid content was also influenced by a minor environmental role that produced opposite effects with RS1 (higher total saturated fatty acids in 2003) and RS2 (lower total saturated fatty acids in 2003). Thus, it can be expected that the level of saturated fatty acids in cultivated hybrid sunflower with RS1 or RS2 as one of the hybrid parents will vary somewhat from year to year. The results of the study also demonstrate that it will be necessary to incorporate the reduced saturated fatty acid trait into both parents of a hybrid in order to achieve the lowest possible concentration of saturated fatty acids in the F2 seed.

Technical Abstract: In 2003 we reported the results of our first-year study on the inheritance of the reduced saturated fatty acid trait of two germplasm lines, RS1 and RS2, which were released in 2001. This year we report the results obtained from the second-year field study. We studied the inheritance of palmitic and stearic acids, the two predominant saturated fatty acids of sunflower seed oil. In a practical sense, the expression of the reduced palmitic and stearic acid traits is most important in the second generation of a hybrid cross (F2 seed) because it is the F2 seed that is harvested by the farmer, sold, and crushed for the oil. Our experiments showed that the F2 seed was intermediate between the two hybrid parents in saturated fatty acid content, and that the inheritance and expression of the reduced palmitic and stearic acid traits of RS1 and RS2 were complex and determined by more than one gene. In addition, there were significant relative changes in palmitic and stearic acid contents between the two growing seasons, suggesting that environmental conditions play a significant role in the relative proportions of palmitic and stearic acids. The total saturated fatty acid content was also influenced by a minor environmental role that produced opposite effects with RS1 (higher total saturated fatty acids in 2003) and RS2 (lower total saturated fatty acids in 2003). Thus, it can be expected that the level of saturated fatty acids in cultivated hybrid sunflower with RS1 or RS2 as one of the hybrid parents will vary somewhat from year to year. The results of the study also demonstrate that it will be necessary to incorporate the reduced saturated fatty acid trait into both parents of a hybrid in order to achieve the lowest possible concentration of saturated fatty acids in the F2 seed.

Last Modified: 7/23/2014
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