QTL mapping of stripe, leaf and stem rust resistance genes in a Kariega x Avocet S doubled haploid wheat population

Prins, R. and Pretorius, Z. A. and Bender, C. M. and Lehmensiek, A. (2011) QTL mapping of stripe, leaf and stem rust resistance genes in a Kariega x Avocet S doubled haploid wheat population. Molecular Breeding: New Strategies in Plant Improvement, 27 (2). pp. 259-270. ISSN 1380-3743

Abstract

Adult plant resistance to stripe (yellow)rust in the wheat cultivar Kariega has previously been ascribed to a major quantitative trait locus (QTL) on each of chromosomes 2B and 7D, along with a number of minor QTL. We have extended both the size of the cv. Kariega 9 cv. Avocet S mapping population, and the marker coverage within it, by assembling a set of Diversity Array Technology (DArT)markers. This has allowed for the analysis of the genetic basis of the adult plant and seedling resistances to stripe, leaf and stem rust present in the two mapping population parents. The stripe rust reactions of the segregating material were assessed in both field (three scoring dates) and greenhouse experiments. The chromosome 2B QTL became more important than the Lr34/Yr18 complex on chromosome 7D as the plants aged. As the infection progressed, the two QTL explained an increasing proportion of the variance for percentage leaf area infected. The cv. Kariega allele at the minor chromosome 4A QTL had a consistent effect on the severity of stripe rust infection and the overall plant reaction at the earlier scoring dates, but lost importance as the disease progressed. Several rust resistances were detected using an improved greenhouse-based test.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author's version not held.
Depositing User: Mrs Julie-Anne Christensen
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 26 Feb 2011 08:48
Last Modified: 03 Jul 2013 00:29
Uncontrolled Keywords: adult plant resistance; QTL mapping; stripe/leaf/stem rust; Triticum aestivum
Fields of Research (FOR2008): 10 Technology > 1001 Agricultural Biotechnology > 100105 Genetically Modified Field Crops and Pasture
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070305 Crop and Pasture Improvement (Selection and Breeding)
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective (SEO2008): B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Identification Number or DOI: doi: 10.1007/s11032-010-9428-y
URI: http://eprints.usq.edu.au/id/eprint/18338

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