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Identification and Validation of Quantitative Trait Loci for Partial Resistance to Crown Rust in Oat

May 2010 , Volume 100 , Number  5
Pages  511 - 521

M. Acevedo, E. W. Jackson, J. Chong, H. W. Rines, S. Harrison, and J. M. Bonman

First, second, and sixth authors: U.S. Department of Agriculture–Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S. 2700 W., Aberdeen, ID 83210; third author: Cereal Research Centre, Agriculture and Agri-Food Canada 195 Dafoe Road, Winnipeg, MB R3T 2M9, Canada; fourth author: USDA-ARS, Department of Agronomy and Plant Genetics, University of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, St. Paul 55108; and fifth author: School of Plant, Environmental and Soil Sciences, Louisiana State University, Baton Rouge.

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Accepted for publication 21 January 2010.

Management of oat crown rust disease with host resistance is challenging because major gene resistance is generally short lived. Partially resistant oat cultivars could benefit oat growers by providing more durable resistance. The objective of this study was to validate and discover quantitative trait loci (QTL) affecting crown rust resistance in the partially resistant oat line MN841801-1 using conventional and molecular assessments of disease produced in single-race greenhouse inoculations, single-race polycyclic field tests, and under natural infection in disease-conducive environments. Crown rust was assessed on 150 F6:9 MN841801-1/‘Noble-2’ recombinant inbred lines. In total, eight QTL associated with MN841801-1 alleles were detected. Of these, seven matched QTL previously identified while a new QTL (Prq8) was detected on linkage group MN13. Four QTL (Prq1a, Prq2, Prq7, and Prq8) were consistently detected and predicative genetic assays for these QTL should be developed for future validation in additional genetic backgrounds.

The American Phytopathological Society, 2010