Development of molecular markers for crown rot resistance in wheat: mapping of QTLs for seedling resistance in a '2-49' x 'Janz' population

Collard, B. C. Y. and Grams, R. A. and Bovill, W. D. and Percy, C. D. and Jolley, R. and Lehmensiek, A. and Wildermuth, G. B. and Sutherland, M. W. (2005) Development of molecular markers for crown rot resistance in wheat: mapping of QTLs for seedling resistance in a '2-49' x 'Janz' population. Plant Breeding, 124 (6). pp. 532-537. ISSN 0179-9541

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Abstract

Crown rot, caused by Fusarium pseudograminearum, is an important disease of wheat in Australia and elsewhere. In order to identify molecular markers associated with partial seedling resistance to this disease, bulked segregant analysis and quantitative trait loci (QTL) mapping approaches were undertaken using a population of 145 doubled haploid lines constructed from '2-49' (partially resistant)x 'Janz' (susceptible) parents. Phenotypic data indicated that the trait is quantitatively inherited. The largest QTLs were located on chromosomes 1D and 1A, and explained 21% and 9% of the phenotypic variance, respectively. Using the best markers associated with five QTLs identified by composite interval mapping, the combined effect of the QTLs explained 40.6% of the phenotypic variance. All resistance alleles were inherited from '2-49' with the exception of a QTL on 2B, which was inherited from 'Janz'. A minor QTL on 4B was loosely linked (19.8 cM) to the Rht1 locus in repulsion. None of the QTLs identified in this study were located in the same region as resistance QTLs identified in other populations segregating for Fusarium head blight, caused by Fusarium graminearum.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Deposited according to Publisher's requirements. The definitive version is available at www.blackwell-synergy.com
Depositing User: Ms Sarah Crundwell
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 00:32
Last Modified: 25 Sep 2013 02:02
Uncontrolled Keywords: Triticum aestivum; bulked segregant analysis; Fusarium head blight; plant height; QTL mapping; molecualr markers; crown rot
Fields of Research (FOR2008): 10 Technology > 1001 Agricultural Biotechnology > 100105 Genetically Modified Field Crops and Pasture
06 Biological Sciences > 0605 Microbiology > 060505 Mycology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070305 Crop and Pasture Improvement (Selection and Breeding)
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: 10.1111/j.1439-0523.2005.01163.x
URI: http://eprints.usq.edu.au/id/eprint/986

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