Lili Qi, Li Gong, Sam Markell, Gerald Seiler, Thomas Gulya Jr., Brent Hulke
Abstract: Two confection sunflower (Helianthus annuus L.) germplasm lines, HA-R10 (Reg. No.xxx, PI670043) and HA-R11 (Reg. No.xxx, PI670044) were developed by the USDA-ARS Sunflower and Plant Biology Research Unit in collaboration with the North Dakota Agricultural Experiment Station and released December, 2013. Sunflower rust (caused by Puccinia helianthi Schwein.) is an emerging production issue for confection sunflower in North America due to spread of new rust races and lack of resistance sources. HA-R10 is a BC3F3-derived BC3F4 maintainer line of confection sunflower selected from the cross CONFSCLB1*4/ HA-R2, and HA-R11 is a BC4F3-derived BC4F4 restorer line of confection sunflower selected from the cross CONFSCLR5*5/HA-R3. The rust resistance gene R5 in HA-R10 and R4 in HA-R11 were introduced from oilseed lines HA-R2 and HA-R3, respectively, with the two confection sunflower populations, CONFSCLB1 and CONFSCLR5, as the recurrent parents. Greenhouse testing of rust resistance and DNA markers were used during development and progeny testing of the germplasm lines. The HA-R10 and HA-R11 are visually similar to the recurrent parents, but possess the rust resistance gene(s) transferred from oilseed sunflower. These sources will afford confection sunflower breeders an opportunity to incorporate rust resistance genes into their parental lines, thus facilitating the development of disease-resistant hybrids.
Located in Sunflower and Plan Biology Research. To view article click here.