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    Fine-mapping the wheat Snn1 locus conferring sensitivity to the Parastagonospora nodorum necrotrophic effector SnTox1 using an eight founder multiparent advanced generation inter-cross population

    234802_234802.pdf (1.470Mb)
    Access Status
    Open access
    Authors
    Cockram, J.
    Scuderi, A.
    Barber, T.
    Furuki, E.
    Gardner, K.
    Gosman, N.
    Kowalczyk, R.
    Phan, H.
    Rose, G.
    Tan, K.
    Oliver, Richard
    Mackay, I.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Cockram, J. and Scuderi, A. and Barber, T. and Furuki, E. and Gardner, K. and Gosman, N. and Kowalczyk, R. et al. 2015. Fine-mapping the wheat Snn1 locus conferring sensitivity to the Parastagonospora nodorum necrotrophic effector SnTox1 using an eight founder multiparent advanced generation inter-cross population. G3: Genes, Genomes, Genetics. 5 (11): pp. 2257-2266.
    Source Title
    G3: Genes, Genomes, Genetics
    DOI
    10.1534/g3.115.021584
    School
    Centre for Crop Disease Management
    Remarks

    This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by/4.0/

    URI
    http://hdl.handle.net/20.500.11937/46450
    Collection
    • Curtin Research Publications
    Abstract

    The necrotrophic fungus Parastagonospora nodorum is an important pathogen of one of the world’s most economically important cereal crops, wheat (Triticum aestivum L.). P. nodorum produces necrotrophic protein effectors that mediate host cell death, providing nutrients for continuation of the infection process. The recent discovery of pathogen effectors has revolutionized disease resistance breeding for necrotrophic diseases in crop species, allowing often complex genetic resistance mechanisms to be broken down into constituent parts. To date, three effectors have been identified in P. nodorum. Here we use the effector, SnTox1, to screen 642 progeny from an eight-parent multiparent advanced generation inter-cross (i.e., MAGIC) population, genotyped with a 90,000-feature single-nucleotide polymorphism array. The MAGIC founders showed a range of sensitivity to SnTox1, with transgressive segregation evident in the progeny. SnTox1 sensitivity showed high heritability, with quantitative trait locus analyses fine-mapping the Snn1 locus to the short arm of chromosome 1B. In addition, a previously undescribed SnTox1 sensitivity locus was identified on the long arm of chromosome 5A, termed here QSnn.niab-5A.1. The peak single-nucleotide polymorphism for the Snn1 locus was converted to the KASP genotyping platform, providing breeders and researchers a simple and cheap diagnostic marker for allelic state at Snn1.

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