Registration of Two Confection Sunflower Germplasm Lines, HA-R10 and HA-R11, Resistant to Sunflower Rust

Abstract

Two confection sunflower (Helianthus annuus L.) germplasm lines, HA‐R10 (Reg. No. GP‐327, PI 670043) and HA‐R11 (Reg. No. GP‐328, PI 670044), developed by the USDA–ARS Sunflower and Plant Biology Research Unit in collaboration with the North Dakota Agricultural Experiment Station were released in December 2013. Both lines have resistance to sunflower rust (caused by Puccinia helianthi Schwein.), which is an emerging production issue for confection sunflower in North America due to the spread of new rust races and the 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 genes 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 genetic stocks CONFSCLB1 and CONFSCLR5 as the recurrent parents. Greenhouse testing of rust resistance and DNA marker‐assisted selection were used during development and progeny testing of the germplasm lines. HA‐R10 and HA‐R11 are morphologically 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.