Brent Hulke, Guojia Ma, Lili Qi, Thomas Gulya
Abstract: Sclerotinia head and stalk rots [caused by Sclerotinia sclerotiorum (Lib.) de Bary] are among the most devastating diseases in sunflower (Helianthus annuus L.). Breeding for resistance to these diseases is complicated by the quantitative inheritance of the resistance, for which there are few genes of major effect. Seven germplasms, RHA 461 (Reg. No.GP-337; PI 655012), RHA 462 (Reg. No.GP-338; PI 655013), RHA 463 (Reg. No. GP-339; PI 655014), RHA 468 (Reg. No. GP-341; PI 667184), HA 465 (Reg. No. GP-342; PI 670488), HA 466 (Reg. No. GP-340; PI 667183), and HA 467 (Reg. No. GP-343; PI 670489) were developed by the USDA-ARS and the North Dakota Agricultural Experiment Station, Fargo, ND, to provide useful genetic variation for Sclerotinia resistance, in a high yielding, high quality background. These germplasms also possess other important agronomic and quality traits, such as high oleic acid in the seed oil, downy mildew resistance, and tolerance to imidazolinone herbicides.
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