Germplasm Enhancement for Resistance to Pyrenophora tritici-repentis in Wheat

Shankar, M.; Mather, Diane E.; Jorgensen, Dorthe; Golzar, H.; Chalmers, K. J.; Hollaway, Grant; McLean, Mark S.; Neate, Stephen M.; Loughman, R.

doi:10.1007/978-4-431-55675-6_21

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…Strong heritability was exhibited by nearly all tan spot severity traits. Within the sub-populations used in this IWD panel, the ICARDA lines identified by Shankar et al (2015) and used here, had almost universally greater average resistance to Australian Ptr isolates than the CIMMYT and AUS sub-populations.…”

Section: Discussionmentioning

confidence: 89%

“…The IWD panel was phenotyped for resistance against a mixture of local isolates at various growth stages and environments in 2015 and2016 at South Perth, Western Australia (S31°59.20', E115°53.13');at Horsham, Victoria (S36°44.61', E142°6.68');and at Toowoomba, Queensland (S27° 32.00', E151° 56.15'). Additionally, the IWD panel was screened for sensitivity to Ptr ToxA and Ptr ToxB at South Perth, Western Australia (S31°59.20', E115°53.13').…”

Section: Plant Materialsmentioning

confidence: 99%

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An international wheat diversity panel reveals novel sources of genetic resistance to tan spot in Australia

et al. 2023

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Key message Novel sources of genetic resistance to tan spot in Australia have been discovered using one-step GWAS and genomic prediction models that accounts for additive and non-additive genetic variation. Abstract Tan spot is a foliar disease in wheat caused by the fungal pathogen Pyrenophora tritici-repentis (Ptr) and has been reported to generate up to 50% yield losses under favourable disease conditions. Although farming management practices are available to reduce disease, the most economically sustainable approach is establishing genetic resistance through plant breeding. To further understand the genetic basis for disease resistance, we conducted a phenotypic and genetic analysis study using an international diversity panel of 192 wheat lines from the Maize and Wheat Improvement Centre (CIMMYT), the International Centre for Agriculture in the Dry Areas (ICARDA) and Australian (AUS) wheat research programmes. The panel was evaluated using Australian Ptr isolates in 12 experiments conducted in three Australian locations over two years, with assessment for tan spot symptoms at various plant development stages. Phenotypic modelling indicated high heritability for nearly all tan spot traits with ICARDA lines displaying the greatest average resistance. We then conducted a one-step whole-genome analysis of each trait using a high-density SNP array, revealing a large number of highly significant QTL exhibiting a distinct lack of repeatability across the traits. To better summarise the genetic resistance of the lines, a one-step genomic prediction of each tan spot trait was conducted by combining the additive and non-additive predicted genetic effects of the lines. This revealed multiple CIMMYT lines with broad genetic resistance across the developmental stages of the plant which can be utilised in Australian wheat breeding programmes to improve tan spot disease resistance.

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Section: Discussionmentioning

confidence: 89%

Section: Plant Materialsmentioning

confidence: 99%

An international wheat diversity panel reveals novel sources of genetic resistance to tan spot in Australia

et al. 2023

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“…Although the outcome of NE-host sensitivity gene interactions vary depending on the host genotype, the consensus is that the removal of effector sensitivity genes from the host through breeding efforts contributes to the improvement of tan spot resistance [3,[43][44][45], coupled with the introgression of resistance genes into breeding material to improve germplasm [46]. The potential utility of the novel SSR marker molecular presented herein makes it a promising candidate to explore further.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of a Novel Molecular Marker Associated with the Tan Spot Disease Response in Wheat

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Moffat

2021

Agriculture

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After nearly 40 years of DNA molecular marker development in plant breeding, the wheat research community has amassed an extensive collection of molecular markers which have been widely and successfully used for selection of agronomic, physiological and disease resistance traits in wheat breeding programs. Tan spot is a major fungal disease of wheat and a significant global economic challenge and is caused by the necrotrophic fungal pathogen Pyrenophora tritici-repentis (Ptr). Here, the potential for using a PCR-based marker (Ta1AS3422) present on the short arm of wheat chromosome 1A, was evaluated for effectiveness in distinguishing tan spot disease susceptibility. The marker was initially screened against 40 commercial Australian hexaploid wheat varieties, and those that amplified the marker had an overall lower disease score (2.8 ± 0.7 for seedlings and 2.4 ± 0.4 for plants at the tillering stage), compared to those lacking the marker which exhibited a higher disease score (3.6 ± 0.8 for both growth stages). The potential of Ta1AS3422 as a marker for the tan spot disease response was further assessed against a panel of 100 commercial Australian hexaploid wheat varieties. A significant association was observed between marker absence/presence and tan spot disease rating (Pearson’s chi-squared test, χ2 (6) = 20.53, p = 0.002), with absence of Ta1AS3422 associated with susceptibility. This simple and cost-effective PCR-based marker may be useful for varietal improvement against tan spot, although further work is required to validate its effectiveness.

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Necrotrophic Exploitation and Subversion of Plant Defense: A Lifestyle or Just a Phase, and Implications in Breeding Resistance

Lorang

2019

Phytopathology®

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Breeding disease-resistant plants is a critical, environmentally friendly component of any strategy to sustainably feed and clothe the 9.8 billion people expected to live on Earth by 2050. Here, I review current literature detailing plant defense responses as they relate to diverse biological outcomes; disease resistance, susceptibility, and establishment of mutualistic plant–microbial relationships. Of particular interest is the degree to which these outcomes are a function of plant-associated microorganisms’ lifestyles; biotrophic, hemibiotrophic, necrotrophic, or mutualistic. For the sake of brevity, necrotrophic pathogens and the necrotrophic phase of pathogenicity are emphasized in this review, with special attention given to the host-specific pathogens that exploit defense. Defense responses related to generalist necrotrophs and mutualists are discussed in the context of excellent reviews by others. In addition, host evolutionary trade-offs of disease resistance with other desirable traits are considered in the context of breeding for durable disease resistance.

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Germplasm Enhancement for Resistance to Pyrenophora tritici-repentis in Wheat

Cited by 4 publications

References 32 publications

An international wheat diversity panel reveals novel sources of genetic resistance to tan spot in Australia

An international wheat diversity panel reveals novel sources of genetic resistance to tan spot in Australia

Evaluation of a Novel Molecular Marker Associated with the Tan Spot Disease Response in Wheat

Necrotrophic Exploitation and Subversion of Plant Defense: A Lifestyle or Just a Phase, and Implications in Breeding Resistance

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