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    Aspergillus flavus resident in Kenya: high genetic diversity in an ancient population primarily shaped by clonal reproduction and mutation-driven evolution

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    U18ArtIslamAspergillusInthomNodev.pdf (2.049Mb)
    Date
    2018-10
    Author
    Islam, M.S.
    Callicott, K.A.
    Mutegi, C.
    Bandyopadhyay, Ranajit
    Cotty, P.J.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Aspergillus flavus has long been considered to be an asexual species. Although a sexual stage was recently reported for this species from in vitro studies, the amount of recombination ongoing in natural populations and the genetic distance across which meiosis occurs is largely unknown. In the current study, genetic diversity, reproduction and evolution of natural A. flavus populations endemic to Kenya were examined. A total of 2744 isolates recovered from 629 maize-field soils across southern Kenya in two consecutive seasons were characterized at 17 SSR loci, revealing high genetic diversity (9-72 alleles/locus and 2140 haplotypes). Clonal reproduction and persistence of clonal lineages predominated, with many identical haplotypes occurring in multiple soil samples and both seasons. Genetic analyses predicted three distinct lineages with linkage disequilibrium and evolutionary relationships among haplotypes within each lineage suggesting mutation-driven evolution followed by clonal reproduction. Low genetic differentiation among adjacent communities reflected frequent short distance dispersal.
    https://dx.doi.org/10.1016/j.funeco.2018.05.012
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/4630
    Non-IITA Authors ORCID
    Charity Mutegihttps://orcid.org/0000-0002-3188-0480
    Ranajit Bandyopadhyayhttps://orcid.org/0000-0003-2422-4298
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1016/j.funeco.2018.05.012
    Research Themes
    PLANT PRODUCTION & HEALTH
    IITA Subjects
    Aflatoxin; Genetic Improvement; Plant Health; Plant Production
    Agrovoc Terms
    Aspergillus Flavus; Genetic Variation; Reproduction; Evolution; Aflatoxins; Simple Sequence Repeat
    Regions
    Africa; East Africa
    Countries
    Kenya
    Journals
    Fungal Ecology
    Collections
    • Journal and Journal Articles4835
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