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Identification of Quantitative Trait Loci for Resistance to Crown Rust in Oat Line MAM17-5

Plant Breeding and Plant Genetics Program, and Department of Agronomy, University of Wisconsin-Madison, Madison, WI 53706, USA

View larger version (37K): [in a new window]   Fig. 1. Frequency distributions of reaction type scores, rust severity ratings, days to heading, and plant height for the 152 recombinant inbred lines from the cross, Ogle/MAM17-5. Reaction type was recorded based on a 1-to-5 scale, where 1 is highly resistant and 5 is susceptible. Severity was rated based on a 1-to-8 scale in which 1 is 0% leaf area covered by pustules and 8 is approximately 40% or more leaf area covered. Days to heading means days from planting to heading. The values next to the x axis are the upper limit of each category.

View larger version (32K): [in a new window]   Fig. 2. Linkage groups from the framework linkage map (Zhu, 2002) developed on the cross, Ogle/MAM17-5 (OM), showing significant quantitative trait loci (QTL) for crown rust resistance, days to heading and plant height. Map distances are given in Haldane's centi-Morgan. QTL for crown rust resistance are indicated to the right of linkage groups by crosshatch bars (reaction type) and open boxes (rust severity). QTL for days to heading (Hdq) and plant height (Htq) are indicated to the right of linkage groups by lines. Pcq1, Pcq2, and Pcq3 are QTL controlling reaction type. Pcq1, Pcq2, Pcq3 and Pcq4 are QTL controlling rust severity. Molecular markers beginning with letter ‘e’ are AFLP-type, with ‘am’ are SSR-type, and with others are RFLP-type markers.

View larger version (24K): [in a new window]   Fig. 3. Frequency distribution of reaction type averaged on 1999 and 2000 relative to the number of recombinant inbred lines (RILs) with either of the parental genotypes at marker locus e8m2-13. Means of the two RIL classes with either of the genotypes are showed by arrows. The values next to the x axis are the upper limit of each category.