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    Leaf yellowing of the wheat cultivar Mace in the absence of yellowspot disease

    212863.pdf (366.5Kb)
    Access Status
    Open access
    Authors
    Moffat, Caroline
    See, Pao Theen
    Oliver, Richard
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Moffat, C. and See, P. and Oliver, R. 2014. Leaf yellowing of the wheat cultivar Mace in the absence of yellowspot disease. Australasian Plant Pathology. 44 (2): pp. 161-166.
    Source Title
    Australasian Plant Pathology
    DOI
    10.1007/s13313-014-0335-2
    ISSN
    08153191
    School
    Department of Environment and Agriculture
    Remarks

    The final publication is available at Springer via http://doi.org/10.1007/s13313-014-0335-2

    URI
    http://hdl.handle.net/20.500.11937/43352
    Collection
    • Curtin Research Publications
    Abstract

    The wheat variety Mace is currently dominating the southern wheat growing regions of Australia. It is high yielding in most environments and resistant to many diseases including yellow spot (also known as tan spot). However, observations of foliar yellowing of Mace have recently been reported in the field. This has raised concerns over a possible breakdown of resistance to yellow spot, which is caused by the necrotrophic fungal pathogen Pyrenophora triticirepentis. West Australian field samples of yellowing Mace leaves were evaluated for P. triticirepentis infection, and this pathogen was determined to be absent. Instead, Alternaria spp. were isolated from the wheat leaves. Pathogenicity assays showed that the recovered Alternaria spp. were unable to cause disease symptoms on Mace. Furthermore, spontaneous foliar lesions were observed in Mace grown in the absence of pathogens. It is therefore likely that such yellowing is a physiological trait, which will not respond to fungicide application. A marginal impact on yield cannot be excluded.

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