Location: Sunflower and Plant Biology ResearchTitle: Registration of oilseed sunflower germplasms RHA 485, RHA 486, and HA 487, selected for resistance to Phomopsis stalk canker and Sclerotinia, in a high yielding and high-oil background
|MONEY, KENNEDY - North Dakota State University|
Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/16/2019
Publication Date: 7/25/2019
Citation: Money, K., Koehler, B.D., Misar, C.G., Grove, M.S., Underwood, W., Hulke, B.S. 2019. Registration of oilseed sunflower germplasms RHA 485, RHA 486, and HA 487, selected for resistance to Phomopsis stalk canker and Sclerotinia, in a high yielding and high-oil background. Journal of Plant Registrations. 13(3):439-442. https://doi.org/10.3198/jpr2019.02.0008crg.
Interpretive Summary: Three oilseed sunflower inbred lines were released by USDA to provide new sources of resistance to Phomopsis stalk canker, Sclerotinia head rot, and Sclerotinia basal stalk rot, which are three of the most damaging and hard to control diseases of sunflower. They are common diseases in the northern part of the sunflower production region, where most of the sunflowers are grown. In addition to providing resistance to these diseases, they also produce high yield and good crop quality when used as parents of experimental hybrids, which are similar to what producers grow. One line also has high oleic acid in the seed oil, which is important for certain sunflower oil markets, one has resistance to downy mildew (another important disease), and two have tolerance to a popular type of herbicide.
Technical Abstract: Sclerotinia head and basal stalk rot and downy mildew have long caused problems for the sunflower production industry, but Phomopsis stem canker is a disease that is a growing issue in the United States. Our goal was to provide germplasm that contains resistance to one or more of these problematic fungi while also upholding necessary agronomic traits including high yield and tolerance to imidazolinone herbicides. RHA 485 (Reg. No. GP-356, PI 690018) and RHA 486 (Reg. No.GP-357, PI 690019) are restorer inbred germplasms developed by pedigree method and testcross evaluation. RHA 485 has high yield potential with high oil content and low Phomopsis and Sclerotinia head rot incidences in the field. RHA 486 possesses high yield potential, resistance to Phomopsis (average incidence near 0%), and low incidence of Sclerotinia basal stalk rot. HA 487 (Reg. No.GP-358, PI 690442) is a maintainer inbred line that has potential for high yield with disease scores that are comparable to commercial hybrid checks. These lines were released by the USDA-ARS, Fargo, ND, to fill the need for germplasm with resistance to multiple diseases as well as possessing other important agronomic traits.