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Registration of the Restorer Oilseed Sunflower Germplasm RHA 464 Possessing Genes for Resistance to Downy Mildew and Sunflower Rust

Permanent URL:
http://handle.nal.usda.gov/10113/45959
Abstract:
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.
Author(s):
Hulke, B.S. , Miller, J.F. , Gulya, T.J.
Subject(s):
Helianthus annuus , oilseed crops , germplasm , restorer lines , disease resistance , downy mildew , rust diseases , host-pathogen relationships , Puccinia helianthi , Plasmopara halstedii , plant pathogenic fungi , agronomic traits , seed oils
Format:
p. 249-254.
Note:
Includes references
Source:
Journal of plant registrations 2010 Sept., v. 4, no. 3
Language:
English
Year:
2010
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.