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    Frequent shifts in Aspergillus flavus populations associated with maize production in Sonora, Mexico

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    S18ArtOrtegabeltranFrequentInthomNodev.pdf (729.6Kb)
    Date
    2018-03
    Author
    Ortega-Beltran, A.
    Cotty, P.J.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Aspergillus flavus frequently contaminates maize, a critical staple for billions of people, with aflatoxins. Diversity among A. flavus L morphotype populations associated with maize in Sonora, Mexico was assessed and, in total, 869 isolates from 83 fields were placed into 136 vegetative compatibility groups (VCGs) using nitrate-nonutilizing mutants. VCG diversity indices did not differ in four agroecosystems (AES) but diversity significantly differed among years. Frequencies of certain VCGs changed manyfold over single years in both multiple fields and multiple AES. Certain VCGs were highly frequent (>1%) in 2006 but frequencies declined repeatedly in each of the two subsequent years. Other VCGs that had low frequencies in 2006 increased in 2007 and subsequently declined. None of the VCGs were consistently associated with any AES. Fourteen VCGs were considered dominant in at least a single year. However, frequencies often varied significantly among years. Only 9% of VCGs were detected all 3 years whereas 66% were detected in only 1 year. Results suggest that the most realistic measurements of both genetic diversity and the frequency of A. flavus VCGs are obtained by sampling multiple locations in multiple years. Single-season sampling in many locations should not be substituted for sampling over multiple years.
    https://dx.doi.org/10.1094/PHYTO-08-17-0281-R
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3869
    Non-IITA Authors ORCID
    Alejandro Ortega-Beltranhttps://orcid.org/0000-0003-3747-8094
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1094/PHYTO-08-17-0281-R
    IITA Subjects
    Aflatoxin; Maize; Plant Production; Soil Information
    Agrovoc Terms
    Maize; Soil Types; Aflatoxins; Aspergillus Flavus; Vegetative Compatibility Analyses
    Regions
    Acp; North America
    Countries
    Mexico
    Journals
    Phytopathology
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    • Journal and Journal Articles4835
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