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Quantitative Trait Loci for Multiple Disease Resistance in Wild Barley

^a Division of Biological Resources of Sciences, Chonbuk National Univ., Jeonju 561-756, Korea
^b Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331-3002
^c Instituto de Investigaciones Agropecuarias INIA, CRI-Quilamapu, Casilla 426, Chillan, Chile
^d Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
^e Dep. of Plant Pathology, Univ. of Minnesota, St. Paul, MN 55108

View larger version (84K): [in a new window]   Fig. 1. Linkage map of the OUH602/Harrington recombinant inbred line population determined on the basis of simple sequence repeat (SSR) markers. Marker designations are given on the right side of each chromosome. Centimorgan distances were obtained from the Kosambi mapping function and are given on the left side of each linkage group.

View larger version (142K): [in a new window]   Fig. 2. Composite interval mapping LOD scans of linkage groups where quantitative trait loci were detected for spot blotch, net type net blotch (NTNB), Septoria speckled leaf blotch (SSLB), leaf scald, and powdery mildew in the OUH602/Harrington recombinant inbred line population. The horizontal lines indicate significance thresholds for each experiment, estimated from 1000 permutations of the data to maintain the experiment-wise Type I error rate below 5%. A. Spot blotch resistance on chromosome 1(7H). B. NTNB resistance on chromosomes 3(3H), 4(4H), and 5(1H). C. SSLB resistance on chromosome 2(2H) and 6(6H). D. Leaf scald resistance on chromosome 5(1H). E. Powdery mildew resistance on chromosomes 4(4H) and 5(1H). Solid line, experiment 1; broken line, experiment 2. The threshold values for each experiment are given in Table 2.

View larger version (28K): [in a new window]   Fig. 3. Locations of major genes and quantitative trait loci (QTLs) for disease resistance in barley. Major disease resistance loci are indicated on the left side of each chromosome. Loci in the same genetic locations are marked with vertical lines. Resistance QTLs for spot blotch (Rcs), net type net blotch (Rpt), Septoria speckled leaf blotch (Rsp), leaf scald (Rrs) and powdery mildew (Rbg) are indicated on the right side of each chromosome with the estimated BIN location. QTLs identified in cultivated and H. vulgare subsp. spontaneum are labeled in black and blue, respectively. The underlined QTLs were identified in this study. Locations of the major disease resistance genes and QTLs were adopted from Williams (2003) on the U.S. Barley Genome Project internet site (http://www.barleyworld.org). Location of additional QTLs reported by Backes et al. (2003) and Genger et al. (2003) were estimated on the basis of the BIN information for the barley markers and genes available at http://barleygenomics.wsu.edu/; verified 15 July 2005.