Genetic mapping of Tobacco rattle virus resistance and other processing traits in a biparental linkage mapping population

Wednesday, July 28, 2021
1:50 PM - 2:10 PM

Corky ringspot disease is an important potato necrotic tuber syndrome caused by Tobacco rattle virus (TRV) and vectored by stubby root nematodes. High levels of genetic resistance to TRV have been observed in numerous potato breeding programs in North America and Europe yet few resistant clones have been accepted by the industry. The dominant inheritance of TRV resistance and the significant challenges associated with screening germplasm for resistance to soil borne pathogens make this trait an ideal candidate for marker assisted selection. To assess the inheritance of internal tuber necrotic lesion potential and presence of the viral pathogen we evaluated an F1 mapping population generated by crossing a TRV resistant parent (Castle Russet) and a susceptible breeding clone (A06084-1TE) in a field infested with Paratrichodorus allius harboring TRV over three field seasons (2018-2020). Linkage mapping identifies a single dominant quantitative trait locus (QTL) associated with TRV resistance on the distal end of chromosome 9. Foliar and tuber characteristics of field grown plants were also evaluated during the 2020 field season. Conclusions that can be made regarding the inheritance of these characteristics and their potential for marker assisted selection will also be discussed.
Breeding and Genetics