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

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dc.creatorTakan, J.P.
dc.creatorChipili, J.
dc.creatorMuthumeenakshi, S.
dc.creatorTalbot, N.J.
dc.creatorManyasa, E.O.
dc.creatorBandyopadhyay, Ranajit
dc.creatorSere, Y.
dc.creatorNutsugah, S.K.
dc.creatorTalhinhas, P.
dc.creatorHossain, M.A.
dc.creatorBrown, A.
dc.creatorSreenivasaprasad, S.
dc.date2012-02
dc.date2017-02-13T13:41:35Z
dc.date2017-02-13T13:41:35Z
dc.date.accessioned2026-06-27T15:54:05Z
dc.descriptionIn 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.
dc.identifierhttps://hdl.handle.net/10568/79826
dc.identifier.urihttp://hdl.handle.net/123456789/116864
dc.languageen
dc.publisherSpringer
dc.rightsLimited Access
dc.sourceTakan, J.P., Chipili, J., Muthumeenakshi, S., Talbot, N. J., Manyasa, E.O., Bandyopadhyay, R., ... & Sreenivasaprasad, S. (2012). Magnaporthe oryzae populations adapted to finger millet and rice exhibit distinctive patterns of genetic diversity, sexuality and host interaction. Molecular Biotechnology, 50(2), 145-158.
dc.subjectfinger millet
dc.subjectrice
dc.subjectblast disease
dc.subjectmagnaporthe oryzae
dc.subjectpathogen populations
dc.subjectgenetic variation
dc.subjectmating type distribution
dc.subjectfertility status
dc.subjectpathogenicity
dc.subjectadaptive divergence
dc.subjectmolecular biology
dc.subjectbiochemistry
dc.subjectbioengineering
dc.subjectbiotechnology
dc.titleMagnaporthe oryzae populations adapted to finger millet and rice exhibit distinctive patterns of genetic diversity, sexuality and host interaction
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)