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Precision Phenotyping Reveals Novel Loci for Quantitative Resistance to Septoria Tritici Blotch

Plant Phenomics 2019年第1期1卷 58-68页

作者： Steven Yates Alexey Mikaberidze Simon GKrattinger michael abrouk Andreas Hund Kang Yu Bruno Studer Simone Fouche Lukas Meile Danilo Pereira Petteri Karisto Bruce A.McDonald Molecular Plant Breeding Institute of Agricultural SciencesETH ZurichZurichSwitzerland Plant Pathology Institute of Integrative BiologyETH ZurichZurichSwitzerland Biological and Environmental Science and Engineering Division King Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia Crop Science Institute of Agricultural SciencesETH ZurichZurichSwitzerland

Accurate,high-throughput phenotyping for quantitative traits is a limiting factor for progress in plant *** developed an 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 *** than 5.4 million automatically generated phenotypes were associated with 13,648 SNP markers to perform the *** identified 26 chromosome intervals explaining 1.9-10.6%of the variance associated with four independent resistance *** of the intervals overlapped with known STB resistance intervals,suggesting that our phenotyping approach can identify simultaneously(i.e.,in a single experiment)many previously defined STB resistance *** of the intervals were less than 5 Mbp in size and encoded only 173 genes,including many genes associated with disease *** intervals contained four or fewer genes,providing high priority targets for functional *** chromosome intervals were not previously associated with STB resistance,perhaps representing resistance to pathogen strains that had not been tested in earlier *** 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 *** experiment illustrates how high-throughput automated phenotyping can accelerate breeding for quantitative disease resistance.

关键词： resistance limiting globally

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