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    Identification of Triazine-Resistant Vulpia bromoides

    Access Status
    Fulltext not available
    Authors
    Ashworth, Michael
    Han, H.
    Knell, G.
    Powles, S.
    Date
    2016
    Type
    Journal Article
    
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    Citation
    Ashworth, M. and Han, H. and Knell, G. and Powles, S. 2016. Identification of Triazine-Resistant Vulpia bromoides. Weed Technology. 30 (2): pp. 456-463.
    Source Title
    Weed Technology
    DOI
    10.1614/WT-D-15-00127.1
    ISSN
    0890-037X
    School
    Centre for Crop Disease Management
    URI
    http://hdl.handle.net/20.500.11937/42159
    Collection
    • Curtin Research Publications
    Abstract

    In Australia, triazine herbicides have routinely controlled the Vulpia species (Vulpia bromoides, Vulpia myuros, and Vulpia fasciculata; collectively referred to as silvergrass). However, a simazine-resistant silvergrass biotype, collected from Pingelly in the Western Australian grain belt in 2014, has been confirmed. Compared to the pooled mortality of three simazine-susceptible silvergrass populations (S1, S2, and S3), the simazine-resistant Pingelly population was > 594-fold resistant at the LD50 level. Dose-response screening of the simazine-selected progeny (> 800 g ai simazine ha−1) demonstrated that the simazine resistance mechanism was heritable. Sequencing of the chloroplast psbA gene revealed the resistant population is homozygous for a serine 264 to glycine mutation, which confers a high-level triazine resistance. As expected this Ser-264-Gly mutation conferred resistance to atrazine and metribuzin, but not the phenyl-urea diuron. This is the first published report confirming field-evolved triazine resistance in a Vulpia population.

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