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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 678571 | HA-BSR1 | Helianthus annuus L. | North Dakota, United States | NC7 | | | 2016 | DEVELOPED | | | | | | Breeding material | A sunflower (Helianthus annuus L.) germplasm HA-BSR1 was selected for Sclerotinia basal stack rot (BSR) resistance from an F7-derived recombinant inbred line (RIL) population developed from the cross HA 441/RHA 439. The cross of HA 441/RHA 439 was made in 2004, and the seed of a single head was used as the progenitor of the F2 population. The RIL population was advanced from the F2 through the F7 in the greenhouse by single-seed descent. Each F7 line was grown in one row of 25 plants at Fargo, ND, in 2010 and the harvested F8 seeds were bulked to form individual RILs. Both the parents, HA 441 and RHA 439, were moderately tolerant to Sclerotinia BSR. The selected RIL line, HA-BSR1 (RIL25) was tested for resistance to BSR along with the parents, and both susceptible and resistant checks in inoculated field screening nurseries across seven environments in North Dakota and Minnesota during 2012 to 2015. HA-BSR1 consistently showed high levels of BSR resistance across all environments with a mean disease incidence (DI) of 2%, which was significantly lower than the parents RHA 439 (DI 14%) and HA 441 (DI 21%) and the resistant hybrid check Croplan 305 (DI 10%). The susceptible checks, HA 89 (DI 31%) and Cargill 270 (DI 33%) had the highest DI across all environments. Genetic analysis of the HA-BSR1 line confirmed the presence of alleles associated with two major quantitative trait loci (QTL), QTLbsr-10.1 and QTLbsr-17.1 conferring resistance against Sclerotinia BSR identified in the RIL population. The resistance allele of QTLbsr-10.1 was contributed by the RHA 439 parent, while the resistance allele of QTLbsr-17.1 was contributed by HA 441, each explained 32 and 20% of the BSR variation in the RIL population, respectively. The combined effect of these two resistance alleles significantly reduced the BSR disease incidence in the HA-BSR1 line. | 1942869 | PI 678571 |