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Dep. of Plant Science, McGill Univ., 21111 Lakeshore, Ste-Anne-de-Bellevue, QC H9X 3V9, Canada
W.G. Thompson & Sons Ltd., Blenheim, ON N0P 1A0, Canada
Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre, Ottawa, ON K1A 0C6, Canada
Dep. of Crop Science, Univ of Guelph, Guelph, ON N1G 2W1, Canada
Dep. of Agriculture, Food, and Nutritional Science, Univ. of Alberta, Edmonton, AB T6G 2P5, Canada
Agriculture and Agri-Food Canada Research Centre, Brandon, MB R7A 5Y3, Canada
Dep. of Crop and Soil Science, Washington State Univ., Pullman, WA 99163-6420
Dep. of Plant Pathology, North Dakota State Univ., Fargo ND 5815
* Corresponding author (mather{at}agradm.lan.mcgill.ca).
Using field-scored data of disease severity under natural infestation, we mapped loci affecting resistance to powdery mildew (Blumeria graminis DC f. sp. hordei Ém. Marchal), leaf rust (Puccinia hordei Otth.), stem rust (Puccinia graminis f. sp. tritici Eriks. & E. Henn.), scald [Rhynchosporium secalis (Oudem.) J.J. Davis], and net blotch (Pyrenophora teres Drechs.). The mapping population included parents and doubled-haploid progeny of the two-row barley cross Harrington/TR306. Resistance was affected by two to five loci, explaining 8 to 45% of the phenotypic variance, per disease. All chromosomes, except chromosome 5 (1H), contained regions with at least one disease resistance locus. One region on chromosome 4 (4H) contributed to resistance to stem rust, scald, and net blotch. This region has previously been reported to affect days to heading and maturity. Two known resistance genes in the population, Rpgl and M1g, were mapped to within 3 centimorgans (cM) of their previously estimated genomic locations by simple interval mapping of the field-scored data. This indicates that the genomic positions of disease resistance genes can be estimated accurately with simple interval mapping, even on the basis of field-scored data.
Received for publication August 25, 1997.
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