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United States Department of Agriculture

Agricultural Research Service

Title: Registration of Imidazolinone Herbicide-Resistant Maintainer (Ha 442) and Fertility Restorer (Rha 443) Oilseed Sunflower Germplasms

Authors
item Miller, Jerry
item Gulya, Thomas
item Vick, Brady

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 30, 2005
Publication Date: January 1, 2006
Citation: Miller, J.F., Gulya Jr, T.J., Vick, B.A. 2006. Registration of imidazolinone herbicide-resistant maintainer (HA 442) and fertility restorer (RHA 443) oilseed sunflower germplasms. Crop Science. 46:483-484.

Interpretive Summary: One maintainer (HA 442) and one fertility restorer (RHA 443) oilseed sunflower germplasms were developed and released by the USDA-ARS, Fargo, ND, and the North Dakota Agricultural Experiment Station, Fargo, ND. These germplasms are resistant to the imidazolinone herbicide imazamox (Beyond, BASF Corporation, Mount Olive, NJ) and are available for use by industry and public researchers to create hybrids, parental lines, or improved germplasm with resistance to imidazolinone herbicides. The imazamox herbicide controls many broadleaf and grassy weeds which cause economic losses to sunflower producers in the USA. HA 442 is an F6-derived F7 maintainer line with high oleic fatty acid concentration as well as the imazamox herbicide resistance. This line could be utilized to produce NuSun (mid-oleic fatty acid concentration) hybrids that produce vegetable oil in demand by the frying industry. The imazamox herbicide resistance was derived from a wild Helianthus annuus L. population collected in Kansas that had natural resistance to the herbicide. RHA 443 is an F6-derived F7 fertility restorer line with resistance to downy mildew as well as the imazamox herbicide resistance. Resistance to downy mildew was derived from a USDA-ARS line, RHA 419, which was a cross of cultivated sunflower with a wild Helianthus argophyllus accession. RHA 443 also provides protection against metalaxyl-insensitive strains of downy mildew collected from sunflower production fields in North Dakota. These lines provide increased genetic diversity to sunflower industry and public improvement programs.

Technical Abstract: One maintainer (HA 442) and one fertility restorer (RHA 443) oilseed sunflower (Helianthus annuus L.) germplasms were developed and released by the USDA-ARS, Fargo, ND, and the North Dakota Agricultural Experiment Station, Fargo, ND. These germplasms are resistant to the imidazolinone herbicide imazamox (Beyond, BASF Corporation, Mount Olive, NJ) and are available for use by industry and public researchers to create hybrids, parental lines, or improved germplasm with resistance to imidazolinone herbicides. The imazamox herbicide controls many broadleaf and grassy weeds which cause economic losses to sunflower producers in the USA. HA 442 is an F6-derived F7 maintainer line with high oleic fatty acid concentration as well as the imazamox herbicide resistance. This line could be utilized to produce NuSun (mid-oleic fatty acid concentration) hybrids that produce vegetable oil in demand by the frying industry. The imazamox herbicide resistance was derived from a wild Helianthus annuus L. population collected in Kansas that had natural resistance to the herbicide. RHA 443 is an F6-derived F7 fertility restorer line with resistance to downy mildew [caused by Plasmopara halstedii (Farl.) Berl. & De Toni in Sacc.] as well as the imazamox herbicide resistance. Resistance to downy mildew was derived from a USDA-ARS line, RHA 419, which was a cross of cultivated sunflower with a wild Helianthus argophyllus accession. RHA 443 also provides protection against metalaxyl-insensitive strains of downy mildew collected from sunflower production fields in North Dakota. These lines provide increased genetic diversity to sunflower industry and public improvement programs.

Last Modified: 9/10/2014
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