Resistance to crown rot in wheat identified through an improved method for screening adult plants

Wallwork, H.; Butt, M.; Cheong, Judy; Williams, Kevin Jon

doi:10.1071/ap03073

Cited by 95 publications

(104 citation statements)

References 15 publications

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“…In the original analysis of the 2-49/Janz population (Collard et al, 2005) this QTL was found to be linked in repulsion to the dwarfing gene allele Rht1. Wallwork et al (2004) identified a QTL in a similar region in a Kukri/Janz population, which explained up to 48 % of the relatively narrow phenotypic variance observed. In the Sunco/2-49 population, this QTL explained up to 22.0 % of a much larger phenotypic variance.…”

Section: Resultsmentioning

confidence: 99%

Pyramiding QTL increases seedling resistance to crown rot (Fusarium pseudograminearum) of wheat (Triticum aestivum)

et al. 2010

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Crown rot of wheat (Triticum aestivum), predominantly caused by the fungus Fusarium pseudograminearum, has become an increasingly important disease constraint in many winter cereal production regions in Australia. Our group has previously identified a range of quantitative trait loci (QTL) for partial resistance to crown rot in various bread wheat sources. Here we report on work that has assessed the effectiveness of pyramiding QTL to improve resistance to crown rot. Two doubled haploid populations were analysed -one from a cross between two previously characterised sources of partial seedling resistance (2-49 and W21MMT70; n = 208) and one from a cross between 2-49 and the commercial variety Sunco, a source of adult field resistance (n = 134). Both populations were phenotyped for seedling resistance to crown rot. Microsatellite and DArT markers were used to construct whole genome linkage maps for use in composite interval mapping (CIM) to identify QTL. Three QTL were detected in both trials conducted on the 2-49/W21MMT70 population. These were located on chromosomes 1D (QCr.usq-1D.1), 3B (QCr.usq-3B.1) and 7A. QCr.usq-1D.1 and the previously undetected 7A QTL were inherited from 2-49. QCr.usq-3B.1, inherited from W21MMT70, was the most significant of the QTL, explaining up to 40.5 % of the phenotypic variance. Three QTL were identified in multiple trials of the Sunco/2-49 population. These were located on chromosomes 1D (QCr.usq-1D.1), 2B (QCr.usq-2B.2) and 4B (QCr.usq-4B.1). Only QCr.usq-2B.2 was inherited from Sunco. QCr.usq-4B.1 was the most significant of these QTL, explaining up to 19.1 % of the phenotypic variance.In the 2-49/W21MMT70 population several DH lines performed significantly better than either parent, with the best recording an average disease severity rating of only 3.8 % of that scored by the susceptible check cultivar Puseas. These lines represent a new level of seedling crown rot resistance in wheat.

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Section: Resultsmentioning

confidence: 99%

Pyramiding QTL increases seedling resistance to crown rot (Fusarium pseudograminearum) of wheat (Triticum aestivum)

et al. 2010

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“…Selection for this trait would be greatly assisted by the development of closely linked molecular markers suitable for deployment in a marker assisted selection (MAS) program. To date, there have been only 3 published reports of the identification of markers associated with crown rot resistance (Wallwork et al 2004;Collard et al 2005;Bovill et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Confirmation of QTL mapping and marker validation for partial seedling resistance to crown rot in wheat line '2-49'

Collard

Jolley

Bovill

et al. 2006

Aust. J. Agric. Res.

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Abstract. We have tested the efficacy of putative microsatellite single sequence repeat (SSR) markers, previously identified in a 2-49 (Gluyas Early/Gala) × Janz doubled haploid wheat (Triticum aestivum) population, as being linked to partial seedling resistance to crown rot disease caused by Fusarium pseudograminearum. The quantitative trait loci (QTLs) delineated by these markers have been tested for linkage to resistance in an independent Gluyas Early × Janz doubled haploid population. The presence of a major QTL on chromosome 1DL (QCr.usq-1D1) and a minor QTL on chromosome 2BS (QCr.usq-2B1) was confirmed. However, a putative minor QTL on chromosome 2A was not confirmed. The QTL on 1D was inherited from Gluyas Early, a direct parent of 2-49, whereas the 2B QTL was inherited from Janz. Three other putative QTLs identified in 2-49 × Janz (on 1AL, 4BL, and 7BS) were inherited by 2-49 from Gala and were not able to be confirmed in this study. The screening of SSR markers on a small sample of elite wheat genotypes indicated that not all of the most tightly linked SSR markers flanking the major QTLs on 1D and 1A were polymorphic in all backgrounds, indicating the need for additional flanking markers when backcrossing into some elite pedigrees. Comparison of SSR haplotypes with those of other genotypes exhibiting partial crown rot resistance suggests that additional, novel sources of crown rot resistance are available.

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“…In Australia crown rot is a chronic problem of wheat production inflicting a loss of >A$ 56 million annually. It is particularly damaging in Queensland, northern New South Wales and parts of South Australia (Williams et al 2002), and its significance in South Australia has risen with the increasing importance of durum varieties that are highly susceptible (Wallwork et al 2004). In the USA the disease occurs in the states of Idaho, Oregon, Washington, Colorado, Wyoming and Texas where it is variously named as crown rot, dryland foot rot, foot rot, dryland root rot and root rot; all have a complex aetiology with F. pseudograminearum, F. culmorum and F. avenaceum as the dominant pathogens (Paulitz et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Multilocus sequence analysis of Fusarium pseudograminearum reveals a single phylogenetic species

Scott

Chakraborty

2006

Mycological Research

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Resistance to crown rot in wheat identified through an improved method for screening adult plants

Cited by 95 publications

References 15 publications

Pyramiding QTL increases seedling resistance to crown rot (Fusarium pseudograminearum) of wheat (Triticum aestivum)

Pyramiding QTL increases seedling resistance to crown rot (Fusarium pseudograminearum) of wheat (Triticum aestivum)

Confirmation of QTL mapping and marker validation for partial seedling resistance to crown rot in wheat line '2-49'

Multilocus sequence analysis of Fusarium pseudograminearum reveals a single phylogenetic species

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