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    A global overview of cassava genetic diversity

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    U19ArtFergusonGlobalInthomNodev.pdf (1.446Mb)
    Date
    2019-11-06
    Author
    Ferguson, M.
    Shah, T.
    Kulakow, P.
    Ceballos, H.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Although numerous studies of diversity have been conducted in cassava, there is no comprehensive assessment of global genetic diversity. Here we draw on previous studies and breeders’ knowledge to select diversity sets from the International Institute of Tropical Agriculture (IITA) and the International Center for Tropical Agriculture (CIAT) genebanks and breeders’ germplasm, as well as elite germplasm and landraces from eastern, southern and central (ESC) Africa to make a global assessment of diversity in cassava, using a SNP based GoldenGate (Illumina Inc.) assay. A synthesis of results from genetic distance and ADMIXTURE analysis essentially revealed four populations (i) South American germplasm characterised by relatively higher genetic diversity with hypothetical ancestral founder genotypes from Brazil, (ii) a smaller group of African introduction germplasm which is more distantly related to all other germplasm, (iii) West Africa germplasm dominated by IITA breeding lines, containing sources of cassava mosaic disease resistance, and IITA genebank accessions from West Africa, both characterised by slightly lower diversity, and (iv) a less cohesive group of African germplasm, termed ‘Other’, with moderate levels of diversity and a majority of germplasm from ESC Africa. This study highlights opportunities for heterosis breeding, purging of duplicates in genebanks and the need for conservation of ESC Africa landraces.
    https://dx.doi.org/10.1371/journal.pone.0224763
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6551
    Non-IITA Authors ORCID
    Morag Fergusonhttps://orcid.org/0000-0002-7763-5173
    Trushar Shahhttps://orcid.org/0000-0002-0091-7981
    Peter Kulakowhttps://orcid.org/0000-0002-7574-2645
    Hernan Ceballoshttps://orcid.org/0000-0002-8744-7918
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1371/journal.pone.0224763
    Research Themes
    BIOMETRICS; BIOTECH & PLANT BREEDING
    IITA Subjects
    Biometrics; Cassava; Genetic Improvement; Plant Breeding; Plant Genetic Resources
    Agrovoc Terms
    Cassava; Genetic Diversity; Germplasm Banks; Disease Resistance
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    PLOS ONE
    Collections
    • Journal and Journal Articles4835
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