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    Re-defining the yam (Dioscorea spp.) core collection using morphological traits

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    S17ArtGirmatessemaRedefiningInthomDev.pdf (321.5Kb)
    Date
    2017-05-03
    Author
    Girma Tessema, G.
    Bhattacharjee, R.
    López Montes, A.
    Gueye, B.
    Ofodile, S.
    Franco, J.
    Abberton, M.T.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Development of core collection representing the diversity in the entire germplasm creates a better access and enhanced utilization of the main collection thus allowing rapid evaluation in crop improvement programs. Core collections are dynamic in nature and needs revisiting when additional germplasm and information becomes available. In the current study, an attempt was made to re-define the previously developed yam (Dioscorea spp) core collection using 56 morphological traits. Information on additional acquired germplasm and presence of duplicates or mislabelled accessions in the entire collection was also used. The re-defined core collection consisted of 843 accessions and represented about 20% of the entire collection. It included six Dioscorea species, of which accessions of Dioscorea rotundata are in the majority (73.54%) followed by Dioscorea alata (21.35%), Dioscorea bulbifera (1.66%), Dioscorea cayenensis (1.42%), Dioscorea dumetorum (1.42%) and Dioscorea esculenta (0.59%). The Shannon weaver diversity index and principal component analysis revealed the maximum diversity captured in the core from the base collection. This re-defined core collection is more valuable than the original core since it represents true-to-type accessions ensuring reliability for enhanced utilization of germplasm in yam improvement programs.
    https://doi.org/10.1017/S1479262117000144
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1868
    Digital Object Identifier (DOI)
    https://doi.org/10.1017/S1479262117000144
    IITA Subjects
    Genetic Improvement; Plant Genetic Resources; Yam
    Agrovoc Terms
    Dioscorea; Yams; Core Collection; Morphological Traits; Phenotypic Diversity
    Regions
    Africa; West Africa
    Countries
    Benin; Nigeria; Togo
    Journals
    Plant Genetic Resources-Characterization and Utilization
    Collections
    • Journal and Journal Articles5283
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