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    Magnaporthe oryzae populations adapted to finger millet and rice exhibit distinctive patterns of genetic diversity, sexuality and host interaction

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    S12ArtTakanMagnaportheInthomDev.pdf (911.1Kb)
    Date
    2012
    Author
    Takan, J.P.
    Chipili, J.
    Muthumeenakshi, S.
    Talbot, N.J.
    Manyasa, E.O.
    Bandyopadhyay, Ranajit
    Sere, Y.
    Nutsugah, S.K.
    Talhinhas, P.
    Hossain, M.A.
    Brown, A.
    Sreenivasaprasad, S.
    Type
    Journal Article
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    Abstract/Description
    In this study, host-specific forms of the blast pathogen Magnaporthe oryzae in sub-Saharan Africa (SSA) were characterised from distinct cropping locations using a combination of molecular and biological assays. Finger millet blast populations in East Africa revealed a continuous genetic variation pattern and lack of clonal lineages, with a wide range of haplotypes. M. oryzae populations lacked the grasshopper (grh) element (96%) and appeared distinct to those in Asia. An overall near equal distribution (47–53%) of the mating types MAT1-1 and MAT1-2, high fertility status (84–89%) and the dominance of hermaphrodites (64%) suggest a strong sexual reproductive potential. Differences in pathogen aggressiveness and lack of cultivar incompatibility suggest the importance of quantitative resistance. Rice blast populations in West Africa showed a typical lineage-based structure. Among the nine lineages identified, three comprised ~90% of the isolates. Skewed distribution of the mating types MAT1-1 (29%) and MAT1-2 (71%) was accompanied by low fertility. Clear differences in cultivar compatibility within and between lineages suggest R gene-mediated interactions. Distinctive patterns of genetic diversity, sexual reproductive potential and pathogenicity suggest adaptive divergence of host-specific forms of M. oryzae populations linked to crop domestication and agricultural intensification.
    https://dx.doi.org/10.1007/s12033-011-9429-z
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1548
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s12033-011-9429-z
    IITA Subjects
    Genetic Improvement; Food Security
    Agrovoc Terms
    Finger Millet; Rice; Blast Disease; Magnaporthe Oryzae; Pathogen Populations; Genetic Variation; Mating Type Distribution; Fertility Status; Pathogenicity; Adaptive Divergence
    Regions
    Africa; West Africa; East Africa
    Countries
    Ghana; Nigeria; Kenya; Uganda
    Journals
    Molecular Biotechnology
    Collections
    • Journal and Journal Articles4835
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