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ARS Home » Pacific West Area » Aberdeen, Idaho » Small Grains and Potato Germplasm Research » Research » Publications at this Location » Publication #390297

Research Project: Improvement of Barley and Oat for Enhanced Productivity, Quality, and Stress Resistance

Location: Small Grains and Potato Germplasm Research

Title: Oat crown rust resistance gene Pc96 mapped to chromosome 7DL, a region rich in other oat crown rust resistance genes

item ABDULLAH, SIDRAT - Oak Ridge Institute For Science And Education (ORISE)
item Gordon, Tyler
item YIMER, BELAYNEH - University Of Idaho
item HARRISON, STEPHEN - Louisiana State University
item MENZIES, JAMES - Agriculture And Agri-Food Canada
item Esvelt Klos, Kathy

Submitted to: International Cereal Rust and Powdery Mildew Conference
Publication Type: Abstract Only
Publication Acceptance Date: 12/6/2021
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Crown rust caused by Puccinia coronata Corda f. sp. avenae (P. Syd. & Syd.) (Pca), is a major constraint to oat production globally. Host resistance is commonly used to curb crown rust epidemics. Combining multiple sources of crown rust resistance (Pc genes) in a single genetic background can be expedited by identification of molecular markers tightly linked with resistance. The oOat crown rust resistance gene, Pc96, was mapped to Mrg02 (chromosome 7D) between 60.4 and 92.5 cM with a peak LOD at 87.3 cM using multiple interval mapping with 822 Illumina array SNPs. This QTL region was validated in two additional biparental populations, and a diverse panel of 635 oat Avena lines was used to evaluate the performance of linked SNP markers. Seven SNPs in the Pc96 resistance locus region were predictive of Pc96/crown rust resistance in a diverse oat panel and will be useful marker-assisted selection tools in oat breeding. Previous studies reported eight other oat crown rust QTL and one crown rust resistance gene, Pc54, on chromosome arm 7DL indicating this is a region rich in resistance genes that warrants further investigation.