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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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Takan, J. P., Chipili, J., Muthumeenakshi, S., Talbot, Nick (Nicholas J.), Manyasa, E. O., Bandyopadhyay, R., Sere, Y., Nutsugah, S. K., Talhinhas, Pedro, Hossain, M., Brown, A. E. and Sreenivasaprasad, S. (2012) Magnaporthe oryzae populations adapted to finger millet and rice exhibit distinctive patterns of genetic diversity, sexuality and host interaction. Molecular Biotechnology, Vol.50 (No.2). pp. 145-158. doi:10.1007/s12033-011-9429-z ISSN 1073-6085.
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Official URL: http://dx.doi.org/10.1007/s12033-011-9429-z
Abstract
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
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QK Botany S Agriculture > SB Plant culture |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||
Library of Congress Subject Headings (LCSH): | Ragi -- Diseases and pests, Rice -- Diseases and pests, Ragi -- Disease and pest resistance, Rice -- Disease and pest resistance, Rice blast disease, Plant-pathogen relationships | ||||
Journal or Publication Title: | Molecular Biotechnology | ||||
Publisher: | Humana Press, Inc. | ||||
ISSN: | 1073-6085 | ||||
Official Date: | February 2012 | ||||
Dates: |
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Volume: | Vol.50 | ||||
Number: | No.2 | ||||
Page Range: | pp. 145-158 | ||||
DOI: | 10.1007/s12033-011-9429-z | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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