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    Tempered mlo broad-spectrum resistance to barley powdery mildew in an Ethiopian landrace

    241808_241808.pdf (857.8Kb)
    Access Status
    Open access
    Authors
    Ge, Cynthia
    Deng, Weiwei
    Lee, Zheng
    Lopez-Ruiz, Fran
    Schweizer, P.
    Ellwood, Simon
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Ge, C. and Deng, W. and Lee, Z. and Lopez-Ruiz, F. and Schweizer, P. and Ellwood, S. 2016. Tempered mlo broad-spectrum resistance to barley powdery mildew in an Ethiopian landrace. Scientific Reports. 6 (Article number 29558).
    Source Title
    Scientific Reports
    DOI
    10.1038/srep29558
    School
    Centre for Crop Disease Management
    Remarks

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

    URI
    http://hdl.handle.net/20.500.11937/2744
    Collection
    • Curtin Research Publications
    Abstract

    Recessive mutations in the Mlo gene confer broad spectrum resistance in barley (Hordeum vulgare) to powdery mildew (Blumeria graminis f. sp. hordei), a widespread and damaging disease. However, all alleles discovered to date also display deleterious pleiotropic effects, including the naturally occurring mlo-11 mutant which is widely deployed in Europe. Recessive resistance was discovered in Eth295, an Ethiopian landrace, which was developmentally controlled and quantitative without spontaneous cell wall appositions or extensive necrosis and loss of photosynthetic tissue. This resistance is determined by two copies of the mlo-11 repeat units, that occur upstream to the wild-type Mlo gene, compared to 11-12 in commonly grown cultivars and was designated mlo-11 (cnv2). mlo-11 repeat unit copy number-dependent DNA methylation corresponded with cytological and macroscopic phenotypic differences between copy number variants. Sequence data indicated mlo-11 (cnv2) formed via recombination between progenitor mlo-11 repeat units and the 3' end of an adjacent stowaway MITE containing region. mlo-11 (cnv2) is the only example of a moderated mlo variant discovered to date and may have arisen by natural selection against the deleterious effects of the progenitor mlo-11 repeat unit configuration.

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