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    Association mapping of plant sex and cross-compatibility related traits in white Guinea yam (Dioscorea rotundata Poir.) clones

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    Journal Article (736.1Kb)
    Date
    2022-06-15
    Author
    Asfaw, A.
    Mondo, J.
    Agre, A.P.
    Asiedu, R.
    Akoroda, M.O.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Background White Guinea yam (Dioscorea rotundata) is primarily a dioecious species with distinct male and female plants. Its breeding is constrained by sexual reproduction abnormalities, resulting in low success rates in cross-pollination. An accurate method for early detection of this plant’s sex and compatible fertile parents at the seedling stage would improve levels of cross-pollination success in breeding. We used the genome-wide association studies (GWAS) to dissect the molecular basis of plant sex and cross-compatibility-related traits in a panel of 112 parental clones used in D. rotundata crossing blocks from 2010 to 2020. Results Population structure and phylogeny analyses using 8326 single nucleotide polymorphism (SNP) markers grouped the 112 white yam clones into three subpopulations. Using Multi-locus random-SNP-effect Mixed Linear Model, we identified three, one, and three SNP markers that were significantly associated with the average crossability rate (ACR), the percentage of high crossability (PHC), and the plant sex, respectively. In addition, five genes considered to be directly linked to sexual reproduction or regulating the balance of sex hormones were annotated from chromosomal regions controlling the assessed traits. This study confirmed the female heterogametic sex determination (ZZ/ZW) system proposed for D. rotundata. Conclusions This study provides valuable insights on the genomic control of sex identity and cross-pollination success in D. rotundata. It, therefore, opens an avenue for developing molecular markers for predicting plant sex and cross-pollination success at the early growth stage before field sex expression in this crop.
    https://dx.doi.org/10.1186/s12870-022-03673-y
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7536
    IITA Authors ORCID
    Asrat Asfawhttps://orcid.org/0000-0002-4859-0631
    Paterne AGREhttps://orcid.org/0000-0003-1231-2530
    Robert Asieduhttps://orcid.org/0000-0001-8943-2376
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1186/s12870-022-03673-y
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Aflatoxin; Agronomy; Crop Systems; Genetic Improvement; Plant Breeding; Plant Genetic Resources; Yam
    Agrovoc Terms
    Genes; Cross-pollination; Population Structure; Sex Determination; Plant Breeding; Dioscorea Rotundata
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    BMC Plant Biology
    Collections
    • Journal and Journal Articles4586
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