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    Founder events influence structures of Aspergillus flavus populations

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    Journal Article (676.7Kb)
    Date
    2020-08
    Author
    Ortega‐Beltran, A.
    Callicott, K.A.
    Cotty, P.J.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    In warm regions, agricultural fields are occupied by complex Aspergillus flavus communities composed of isolates in many vegetative compatibility groups (VCGs) with varying abilities to produce highly toxic, carcinogenic aflatoxins. Aflatoxin contamination is reduced with biocontrol products that enable atoxigenic isolates from atoxigenic VCGs to dominate the population. Shifts in VCG frequencies similar to those caused by the introduction of biocontrol isolates were detected in Sonora, Mexico, where biocontrol is not currently practiced. The shifts were attributed to founder events. Although VCGs reproduce clonally, significant diversity exists within VCGs. Simple sequence repeat (SSR) fingerprinting revealed that increased frequencies of VCG YV150 involved a single haplotype. This is consistent with a founder event. Additionally, great diversity was detected among 82 YV150 isolates collected over 20 years across Mexico and the United States. Thirty‐six YV150 haplotypes were separated into two populations by Structure and SplitsTree analyses. Sixty‐five percent of isolates had MAT1‐1 and belonged to one population. The remaining had MAT1‐2 and belonged to the second population. SSR alleles varied within populations, but recombination between populations was not detected despite co‐occurrence at some locations. Results suggest that YV150 isolates with opposite mating‐type have either strongly restrained or lost sexual reproduction among themselves.
    https://dx.doi.org/10.1111/1462-2920.15122
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7667
    IITA Authors ORCID
    Alejandro Ortega-Beltranhttps://orcid.org/0000-0003-3747-8094
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1111/1462-2920.15122
    Research Themes
    Plant Production and Health
    IITA Subjects
    Aflatoxin; Agronomy; Disease Control; Food Security; Maize; Plant Breeding; Plant Diseases; Plant Health; Plant Production
    Agrovoc Terms
    Aspergillus Flavus; Aflatoxins; Maize; Biological Control
    Regions
    ACP; North America
    Countries
    Mexico
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Environmental Microbiology
    Collections
    • Journal and Journal Articles4835
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