Registration of the Restorer Oilseed Sunflower Germplasm RHA 464 Possessing Genes for Resistance to Downy Mildew and Sunflower Rust
- B. S. Hulke *,
- J. F. Miller and
- T. J. Gulya
Sunflower rust (caused by Puccinia helianthi Schwein.) has become a more significant threat to U.S. sunflower (Helianthus annuus L.) production as a result of the multiplicity of races, increasing incidence, and lack of commercial hybrids with resistance. Thus, there is a need for new sources of effective rust resistance in the sunflower breeding community. At the same time, resistance to downy mildew [caused by Plasmopara halstedii (Farl.) Berl. & De Toni] is also critical to parental line development because of the major impact of this disease over years. Our objective was to produce a restorer sunflower germplasm with resistance to the most virulent race of sunflower rust, race 777, and combine with it the best currently available downy mildew resistance in a high-yielding genetic background. We achieved this objective by using the pedigree breeding method with early generation selection for rust and downy mildew resistance and late-generation testcross evaluation for yield. The resulting restorer oilseed sunflower (Helianthus annuus L.) germplasm, ‘RHA 464’ (Reg. No. GP-325; PI 655015; experimental ‘05 187’), which has resistance to the two pathogens of interest, was released by the USDA-ARS and the North Dakota Agricultural Experiment Station, Fargo, ND, to fill the urgent need in the sunflower industry for breeding lines with elite genetic background and disease resistance.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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