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    Prevalence and importance of sensitivity to Stagonospora nodorum necrotrophic effector SnTox3 in current Western Australian wheat cultivars.

    Access Status
    Fulltext not available
    Authors
    Lichtenzveig, Judith
    Waters, O.
    Rybak, K.
    Friesen, T.
    Oliver, Richard
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Lichtenzveig, Judith and Waters, Ormonde and Rybak, Kasia and Friesen, Timonthy and Oliver, Richard. 2011. Prevalence and importance of sensitivity to Stagonospora nodorum necrotrophic effector SnTox3 in current Western Australian wheat cultivars. Crop and Pasture Science. 62 (7): pp. 556-562.
    Source Title
    Crop and Pasture Science
    DOI
    10.1071/CP11004
    ISSN
    1836-0947
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/46801
    Collection
    • Curtin Research Publications
    Abstract

    Stagonospora nodorum is a major pathogen of wheat in many parts of the world and particularly in Western Australia. The pathosystem is characterised by interactions of multiple pathogen necrotrophic effectors (NE) (formerly host-specific toxins) with corresponding dominant host sensitivity loci. To date, five NE interactions have been reported in S. nodorum. Two proteinaceous NE (ToxA and SnTox3) have been cloned and expressed in microbial systems. The identification of wheat cultivars lacking sensitivity to one or more NE is a promising way to identify cultivars suitable for use in breeding for increased resistance to this economically important pathogen. The prevalence of sensitivity to the NE SnTox3 was investigated in 60 current Western Australian-adapted bread wheat (Triticum aestivum L.) cultivars. Infiltration of SnTox3 into seedling leaves caused a moderate or strong necrotic response in 52 cultivars. Six cultivars were insensitive and two cultivars exhibited a weak chlorotic response. Five of the cultivars that were insensitive or weakly sensitive to SnTox3 were noticeably more resistant to the disease. The 60 cultivars gave a very similar reaction to SnTox3 and to the crude S. nodorum SN15 culture filtrate demonstrating that SnTox3 is the dominant NE in this isolate. We conclude that a simple screen using both SnTox3 and ToxA effectors combined with simple greenhouse disease evaluation, will allow breeders to select cultivars that are more resistant to the disease, allowing them to concentrate resources on other still intractable breeding objectives.

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