|MAY, WILLIAM - Agri Food - Canada|
Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/22/2017
Publication Date: 1/18/2018
Citation: Hulke, B.S., May, W.E. 2018. Registration of oilseed sunflower restorer germplasms RHA 476 and RHA 477, adapted for short season environments. Journal of Plant Registrations. 12:148-151. https://doi.org/10.3198/jpr2017.07.0048crg.
Interpretive Summary: Two sunflower inbred lines were released by USDA and submitted to the Journal of Plant Registrations to record their usefulness in the development of early maturing sunflower hybrids for double crop and northern growing zone use. RHA 476 is high yielding in northern regions, as compared to commercial check hybrids, and contains high oleic acid levels in the seed oil (near 90%). RHA 477 has yields similar to the commercial checks together with downy mildew resistance and tolerance to the imidazolinone herbicides. These two restorer heterotic group inbred lines can be used to enhance commercial breeding company breeding stock, or can be used directly to develop new hybrids.
Technical Abstract: Northward expansion and double crop use of sunflower (Helianthus annuus L.) is limited by the lack of commercial hybrids with early maturity. We seek to provide the sunflower industry with new, early maturing restorer inbred germplasms with high yield potential and favorable agronomic and seed oil traits, specifically resistance to downy mildew, caused by Plasmopara halstedii [Farl.] Berl. & De Toni, tolerance to postemergent herbicides such as the imidazolinones, and increased oleic acid in the seed oil. RHA 476 (Reg. No. GP-344; PI 682129) and RHA 477 (Reg. No.GP-345; PI 682130) are restorer inbred germplasms that can fill this need. RHA 476 possesses high yield potential and high oleic acid (= 850 g kg-1) in the seed oil. RHA 477 possesses high yield potential, downy mildew resistance conditioned by PlARG, and imidazolinone herbicide tolerance. These lines were released by the USDA-ARS, Fargo, ND, in collaboration with Agriculture and Agri-Food Canada, Indian Head, SK, to fill the need for publicly available lines with early maturity in a high yielding genetic background.