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

Article

Taylor, Julian, Jorgensen, Dorthe, Moff, Caroline S., Chalmers, Ken J., Fox, Rebecca, Hollaway, Grant J., Cook, Melissa J., Neate, Stephen M., See, Pao Theen and Shankar, Manisha. 2023. "An international wheat diversity panel reveals novel sources of genetic resistance to tan spot in Australia." Theoretical and Applied Genetics: international journal of plant breeding research. 136 (3). https://doi.org/10.1007/s00122-023-04332-y
Article Title

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

ERA Journal ID2411
Article CategoryArticle
AuthorsTaylor, Julian, Jorgensen, Dorthe, Moff, Caroline S., Chalmers, Ken J., Fox, Rebecca, Hollaway, Grant J., Cook, Melissa J., Neate, Stephen M., See, Pao Theen and Shankar, Manisha
Journal TitleTheoretical and Applied Genetics: international journal of plant breeding research
Journal Citation136 (3)
Article Number61
Number of Pages19
Year2023
PublisherSpringer
Place of PublicationGermany
ISSN0040-5752
1432-2242
Digital Object Identifier (DOI)https://doi.org/10.1007/s00122-023-04332-y
Web Address (URL)https://link.springer.com/article/10.1007/s00122-023-04332-y
AbstractKey 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.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.
Keywordsgenetic resistance; wheat diversity
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 20203001. Agricultural biotechnology
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Byline AffiliationsUniversity of Adelaide
Department of Primary Industries and Regional Development, Western Australia
Curtin University
Agriculture Victoria
Centre for Crop Health
University of Western Australia
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