Location: Sunflower and Plant Biology ResearchTitle: Registration of genetic stocks TOCO B1, TOCO R1, and TOCO R2 with high gamma- and delta-tocopherol and altered fatty acid composition in the seed oil
Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/11/2019
Publication Date: 7/11/2019
Citation: Hulke, B.S., Winkler-Moser, J.K. 2019. Registration of genetic stocks TOCO B1, TOCO R1, and TOCO R2 with high gamma- and delta-tocopherol and altered fatty acid composition in the seed oil. Journal of Plant Registrations. https://doi.org/10.3198/jpr2018.10.0070crgs.
Interpretive Summary: Vegetable oils contain tocopherols, also known as Vitamin E, which have important antioxidant properties. Of the four types of tocopherols (alpha, beta, delta, gamma), alpha-tocopherol has the greatest Vitamin E activity in humans but has poor oxidative stability in high temperature frying applications. Although sunflower oil is naturally high in alpha-tocopherol, commercial frying application would benefit from increasing the amounts of oxidatively stable forms of delta- and gamma-tocopherols. Here we report the release of one female and two male inbred lines of sunflower, which can be used to develop hybrid sunflower varieties with high delta- and gamma-tocopherol levels in a desirable genetic background.
Technical Abstract: A primary concern of oilseed sunflower (Helianthus annuus L.) breeders in developing commercial hybrids is the constitution of the oil product, particularly the fatty acid composition. Over time, mutation breeding and selection has led to sunflower varieties with very high levels of oleic acid, which increases oxidative stability of the oil. This is beneficial particularly to those food industries that use vegetable oil for frying food. Tocopherols are lipophilic antioxidants that protect vegetable oils from oxidative degradation, and which vary in their antioxidant activity. TOCO B1, TOCO R1, and TOCO R2 contain mutations that increase the '- and d-tocopherol level of the seed, leading to a more stable vegetable oil product. TOCO B1 also possesses an oil profile high in oleic acid. These lines were released by the USDA-ARS and North Dakota Agricultural Experiment Station, Fargo, ND, to fill the need for novel sunflower oil products in the sunflower industry.