Precision phenotyping reveals novel loci for quantitative resistance to septoria tritici blotch in European winter wheat
Krattinger, Simon G.
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AbstractAccurate, high-throughput phenotyping for quantitative traits is the limiting factor for progress in plant breeding. We developed automated image analysis to measure quantitative resistance to septoria tritici blotch (STB), a globally important wheat disease, enabling identification of small chromosome intervals containing plausible candidate genes for STB resistance. 335 winter wheat cultivars were included in a replicated field experiment that experienced natural epidemic development by a highly diverse but fungicide-resistant pathogen population. More than 5.4 million automatically generated phenotypes were associated with 13,648 SNP markers to perform a GWAS. We identified 26 chromosome intervals explaining 1.9-10.6% of the variance associated with four resistance traits. Seventeen of the intervals were less than 5 Mbp in size and encoded only 173 genes, including many genes associated with disease resistance. Five intervals contained four or fewer genes, providing high priority targets for functional validation. Ten chromosome intervals were not previously associated with STB resistance. Our experiment illustrates how high-throughput automated phenotyping can accelerate breeding for quantitative disease resistance. The SNP markers associated with these chromosome intervals can be used to recombine different forms of quantitative STB resistance that are likely to be more durable than pyramids of major resistance genes.
CitationYates S, Mikaberidze A, Krattinger S, Abrouk M, Hund A, et al. (2018) Precision phenotyping reveals novel loci for quantitative resistance to septoria tritici blotch in European winter wheat. Available: http://dx.doi.org/10.1101/502260.
SponsorsSTB research in BAM's lab was supported by the Swiss National Science Foundation (grants 155955, 134755, 104145 and 56874) and the ETH Zurich Research Commission (grants 12-03, 15-02). AM and PK were supported by the Swiss National Science Foundation through Ambizione grant PZ00P3_161453. H. Zellweger managed the wheat trial. Marion Roeder from IPK Gatersleben provided seeds and marker information for the GABI wheat panel.
PublisherCold Spring Harbor Laboratory
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