The application of molecular markers for partial resistance against fusarium crown rot in hexaploid and tetraploid wheats

Sutherland, Mark and Bovill, W. D. and Horne, M. and Lehmensiek, A. and Eberhard, F. and Percy, C. and Wildermuth, G. B. and Simpfendorfer, S. and Hare, R. (2008) The application of molecular markers for partial resistance against fusarium crown rot in hexaploid and tetraploid wheats. In: X International Fusarium and Fusarium Genomics Workshop 2008, 30 Aug - 2 Sept 2008, Sardinia,Italy.

Abstract

In most cereal-growing regions of Australia, the principal cause of crown rot in winter cereals is Fusarium pseudograminearum, although F. culmorum is a significant cause in cooler Southern regions. Analysis of Australian populations to date indicates that while there is variation in aggressiveness, there is no evidence for pathogenic race structure. Using wheat doubled haploid mapping populations incorporating a range of resistance sources (2-49,CPI133814, IRN497, Sunco and W21MMT70), quantitative trait loci (QTL) conditioning partial resistance to crown rot have been identified in seedling and field trials. Different sources of seedling resistance have unique but overlapping combinations of contributing loci, while seedling and field resistance QTL may differ within single host genotypes. Resistance to crown rot in these sources appears to be independent from resistance to head blight, caused by F. graminearum. The degree of phenotypic variation contributed by particular loci varies across genetic backgrounds and trial environments, consistent with the epistatic interactions that are detected by the analysis tools Epistat and QTLNetwork 2.0. Nevertheless, attempts to pyramid resistances from several sources have met with some success. Tetraploid durum wheats are highly susceptible to crown rot under favourable field conditions and the disease is a major constraint on durum production in Australia. While partial resistance has not yet been identified in any durum breeding lines, recent attempts to cross improved resistance from hexaploid sources into tetraploid wheats are encouraging. Currently resistance QTL from hexaploid sources are being analysed for their effectiveness in subsequent generations derived from hexaploid x durum crosses.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Poster)
Refereed: No
Item Status: Live Archive
Additional Information: This is an unrefereed poster paper, and only the abstract is available.
Depositing User: Bulkimport bulkimport
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 04 Mar 2009 15:41
Last Modified: 26 Sep 2013 01:12
Uncontrolled Keywords: hexaploid; crown rot; Fusarium pseudograminearum; wheat
Fields of Research (FOR2008): 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
URI: http://eprints.usq.edu.au/id/eprint/13070

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