Abstract
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Association mapping of resistance to Pyrenophora teres f. teres in a collection of Nordic barley germplasm at different developmental stages revealed 13 quantitative loci with mostly small effects.
Abstract
Net blotch, caused by the necrotrophic fungus Pyrenophora teres, is one of the major diseases in barley in Norway causing quantitative and qualitative yield losses. Resistance in Norwegian cultivars and germplasm is generally insufficient and resistance sources have not been extensively explored yet. In this study, we mapped quantitative trait loci (QTL) associated with resistance to net blotch in Nordic germplasm. We evaluated a collection of 209 mostly Nordic spring barley lines for reactions to net form net blotch (NFNB; Pyrenophora teres f. teres) in inoculations with three single conidia isolates at the seedling stage and in inoculated field trials at the adult stage in 4 years. Using 5669 SNP markers genotyped with the Illumina iSelect 9k Barley SNP Chip and a mixed linear model accounting for population structure and kinship, we found a total of 35 significant marker-trait associations for net blotch resistance, corresponding to 13 QTL, on all chromosomes. Out of these QTL, seven conferred resistance only in adult plants and four were only detectable in seedlings. Two QTL on chromosomes 3H and 6H were significant during both seedling inoculations and adult stage field trials. These are promising candidates for breeding programs using marker-assisted selection strategies. The results elucidate the genetic background of NFNB resistance in Nordic germplasm and suggest that NB resistance is conferred by a number of genes each with small-to-moderate effects, making it necessary to pyramid these genes to achieve sufficient levels of resistance.
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Acknowledgements
This work was supported by funding from the Research Council of Norway (NFR; Project 224833). The Nordic Barley Panel was developed in collaboration with Graminor and kind contributions from barley breeders Lars Reitan and Stein Bergersen at Graminor and Åsmund Bjørnstad and Helge Skinnes at NMBU. We also thank Timothy Friesen at USDA-ARS in Fargo, USA, for teaching seedling inoculation and scoring methodology, and Anja Karine Ruud and all laboratory and field technicians involved in this work for their contributions.
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Wonneberger, R., Ficke, A. & Lillemo, M. Identification of quantitative trait loci associated with resistance to net form net blotch in a collection of Nordic barley germplasm. Theor Appl Genet 130, 2025–2043 (2017). https://doi.org/10.1007/s00122-017-2940-2
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DOI: https://doi.org/10.1007/s00122-017-2940-2