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      Virulence Frequencies in Oat Crown Rust in the United States from 2001 Through 2005

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      Plant Disease
      Scientific Societies

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          A North American System of Nomenclature forPuccinia coronataf. sp.avenae

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            Oat Lines with Effective Adult Plant Resistance to Crown Rust

            K. Leonard (2002)
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              Quantitative trait loci for partial resistance to crown rust, Puccinia coronata, in cultivated oat, Avena sativa L.

              To facilitate the detection of quantitative trait loci (QTLs) for partial resistance to oat crown rust, Puccinia coronata f. sp. avenae Eriks., a genetic map was generated in a population of 158 F(6)-derived oat recombinant inbred lines from a cross of a partial resistance line MN841801-1 by a susceptible cultivar selection 'Noble-2'. The map, developed using 230 marker loci, mostly restriction fragment length polymorphism and amplified fragment length polymorphism markers, spanned 1,509 cM (Haldane) arranged into 30 linkage groups of 2-18 markers each. Four consistently detected major QTLs for partial rust resistance, Prq1a, Prq1b, Prq2, and Prq7, and three minor QTLs, Prq3, Prq5, and Prq6, were found in tests involving three field and two greenhouse environments. In addition, two major QTLs for flowering time, Ftq1 and Ftq7, and five weaker QTLs, Ftq2, Ftq3, Ftq4, Ftq5, and Ftq6, were revealed. Overlapping of the map segments of Ftq1 and Prq1 and of Ftq7 and Prq7 suggested either linkage between the flowering time QTLs and resistance QTLs or a pleiotropic effect of the Ftq QTLs on rust resistance. Relatively low heritability estimates (0.30) obtained for partial resistance to crown rust in the field indicate a potential value for marker-assisted selection.
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                Author and article information

                Journal
                Plant Disease
                Plant Disease
                Scientific Societies
                0191-2917
                March 2008
                March 2008
                : 92
                : 3
                : 379-384
                Affiliations
                [1 ]United States Department of Agriculture–Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108
                Article
                10.1094/PDIS-92-3-0379
                30769684
                7176a1d5-2221-4a6c-affa-0c0bee30395a
                © 2008
                History

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