Potential for effective marker-assisted selection of three quantitative trait loci conferring adult plant resistance to powdery mildew in elite wheat breeding populations

Three quantitative trait loci (QTL) associated with adult plant resistance (APR) to powdery mildew (Blumeria graminis) in wheat (Triticum aestivum) cultivar 'Massey' were mapped in a previous study. The three QTL were located on chromosomes 2A, 2B and 1B, and explained 50% of the total phe...

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Bibliographic Details
Published in:	Plant breeding Vol. 125; no. 5; pp. 430 - 436
Main Authors:	Tucker, D.M, Griffey, C.A, Liu, S, SaghaiMaroof, M.A
Format:	Journal Article
Language:	English
Published:	Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01-10-2006 Blackwell Publishing Ltd Blackwell
Subjects:	adults Agronomy. Soil science and plant productions Biological and medical sciences Blumeria graminis Breeding schemes. Varia chromosomes cultivars disease severity field experimentation Fundamental and applied biological sciences. Psychology Genetics and breeding of economic plants greenhouse experimentation inbred lines marker-assisted selection mildews partial resistance Pest resistance phenotypic variation Plant breeding: fundamental aspects and methodology Plant pathogens powdery mildew quantitative trait loci simple sequence repeats Triticum aestivum Varietal selection. Specialized plant breeding, plant breeding aims wheat Monocotyledones Plant pathogen Marker assisted selection Erysiphe graminis Population improvement High yielding variety Cereal crop Fungus resistance Fungi Quantitative trait loci Sensitivity resistance Gramineae partial resistance Microsatellite DNA Blumeria gram in is Angiospermae Genetic improvement Adult plant Ascomycetes Spermatophyta Nonspecific resistance simple sequence repeats Triticum aestivum Thallophyta
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Summary:	Three quantitative trait loci (QTL) associated with adult plant resistance (APR) to powdery mildew (Blumeria graminis) in wheat (Triticum aestivum) cultivar 'Massey' were mapped in a previous study. The three QTL were located on chromosomes 2A, 2B and 1B, and explained 50% of the total phenotypic variation. A 293 recombinant inbred line (RIL) breeding population (UJ) derived from the cross of 'USG 3209', a derivative of 'Massey', and 'Jaypee' was used to evaluate the potential effectiveness of marker-assisted selection (MAS) for APR. Powdery mildew severities of the 293 UJ RILs were evaluated in 2002 (F₅ : ₆) and 2003 (F₆ : ₇) under natural disease pressure in the field. The 293 RILs were also evaluated for disease severity in a 2004 (F₇ : ₈) greenhouse experiment using a composite of five different isolates of B. graminis. Selection of RILs possessing the QTL on chromosome 2A, and to a lesser extent, the one on chromosome 1B was effective in identifying powdery mildew resistance in both greenhouse and field experiments. Overall, selecting RILs with QTL on chromosomes 2A and 2B was most successful in identifying highly resistant RILs, which had mean mildew severities of 4.4% and 3.2% in 2002 and 2003 field experiments, respectively. Breeders implementing MAS programs for APR to powdery mildew via selection of RILs containing the two QTL on chromosomes 2A and 2B likely will obtain RILs having high levels of resistance in the field, however combining all three QTL may ensure greater durability.
Bibliography:	http://dx.doi.org/10.1111/j.1439-0523.2006.01233.x ark:/67375/WNG-VX06RRD6-Z ArticleID:PBR1233 istex:76F42FDC8E6E530A0BBEA76831975A0EC54321B4 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0179-9541 1439-0523
DOI:	10.1111/j.1439-0523.2006.01233.x