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Identification of quantitative trait loci for resistance to wheat sharp eyespot in the Einstein × Tubbs recombinant inbred line population.

Wheat sharp eyespot (SES), caused by the soil-borne pathogen Rhizotonia cerealis Van der Hoeven (teleomorph: Ceratobasidium cereale) is a common stem disease of wheat globally. The disease caused a severe and extensive epidemic throughout the Willamette Valley of Oregon in 2014 and has remained one of the most important wheat diseases in this region. However, little was known about the genetics of host resistance to this disease. A recombinant inbred line population with 257 lines developed from a cross of 'Einstein' × 'Tubbs' was used to study SES resistance of wheat. The phenotyping was conducted at two locations and in three years. The genotyping by sequencing was done by using Illumina HiSeq 3000 sequencing. Low broad-sense heritability across four environments was obtained. The results of ANOVA demonstrated that disease severity was significantly different among RILs for the data combined over environments and for one of the individual environments. Four SES resistance QTL were detected including QSES-1A, QSES-2B, QSES-6A, and QSES-7A and explained 5.9%, 5.9%, 8.8%, and 8.3% of the phenotypic variance, respectively. All four QTL overlapped or are in close proximity with one or more plant defense genes, and could lay the foundation for marker-assisted breeding. KEY WORDS: wheat sharp eyespot, resistance QTL.