Crown rust, caused by Puccinia coronata f. sp. avenae Erikss., is the most important disease impacting cultivated oat (Avena sativa L.). Genetic resistance is the most desirable management strategy. The genetic architecture of crown rust resistance is not fully understood, and previous mapping investigations have mostly ignored temporal variation. A collection of elite oat lines sourced from oat breeding programs in the American Upper Midwest and Canada was genotyped using a high-density genotyping-by-sequencing system and evaluated for crown rust disease severity at multiple time points throughout the growing season in three disease nursery environments. Genome-wide association mapping was conducted for disease severity on each observation date of each trial, area under the disease progress curve for each trial, heading date for each trial, and area under the disease progress curve in a multi-environment model. Crown rust resistance quantitative trait loci (QTL) were detected on linkage groups Mrg05, Mrg12, Mrg15, Mrg18, Mrg20, and Mrg33. None of these QTL were coincident with a days-to-heading QTL detected on Mrg02. Only the QTL detected on Mrg15 was detected in multiple mapping models. The QTL on Mrg05, Mrg12, Mrg18, Mrg20, and Mrg33 were detected on only a single observation date and were not detected on observations just days before and after. This result uncovers the importance of temporal variation in mapping experiments which is usually ignored. It is possible that high density temporal data could be used to more precisely characterize the nature of plant resistance in other systems.
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http://dx.doi.org/10.1002/tpg2.20007 | DOI Listing |
Plant Dis
January 2025
CSIRO, Agriculture and Food, Canberra, Australian Capital Territory, Australia;
Crown rust caused by the basidiomycete fungus f. sp. () results in significant crop losses worldwide.
View Article and Find Full Text PDFPLoS Genet
November 2024
Commonwealth Scientific and Industrial Research Organisation, Australian Capital Territory, Australia.
Theor Appl Genet
November 2024
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD, Australia.
We revealed the neglected genetic relationships of resistance for six major wheat diseases and established a haploblock-based catalogue with novel forms of resistance by multi-trait haplotype characterisation. Genetic potential to improve multiple disease resistance was highlighted through haplotype stacking simulations. Wheat production is threatened by numerous fungal diseases, but the potential to breed for multiple disease resistance (MDR) mechanisms is yet to be explored.
View Article and Find Full Text PDFPlant Dis
October 2024
National Taiwan University, Department of Agronomy, Taipei, Taiwan;
Plant Biol (Stuttg)
August 2024
UCD School of Biology and Environmental Science and Earth Institute, College of Science, University College Dublin, Dublin, Ireland.
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