• Contact Us
    • Send Feedback
    • Login
    View Item 
    •   Home
    • Journal and Journal Articles
    • Journal and Journal Articles
    • View Item
    •   Home
    • Journal and Journal Articles
    • Journal and Journal Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    Whole Repository
    CollectionsIssue DateRegionCountryHubAffiliationAuthorsTitlesSubject
    This Sub-collection
    Issue DateRegionCountryHubAffiliationAuthorsTitlesSubject

    My Account

    Login

    Welcome to the International Institute of Tropical Agriculture Research Repository

    What would you like to view today?

    Genetic diversity of cassava (Manihot esculenta Crantz) landraces and cultivars from southern, eastern and central Africa

    Thumbnail
    View/Open
    S13ArtKawukiGeneticsInthomDev.pdf (1009.Kb)
    Date
    2013-08
    Author
    Kawuki, Robert S.
    Herselman, L.
    Labuschagne, M.T.
    Nzuki, I.
    Ralimanana, I.
    Bidiaka, M.
    Kanyange, M.C.
    Gashaka, G.
    Masumba, E.
    Mkamilo, G.S.
    Gethi, J.
    Wanjala, B.W.
    Zacarias, A.
    Madabula, F.
    Ferguson, M.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
    Show full item record
    Abstract/Description
    Studies to quantify genetic variation in cassava germplasm, available within the national breeding programmes in Africa, have been limited. Here, we report on the nature and extent of genetic variation that exists within 1401 cassava varieties from seven countries: Tanzania (270 genotypes); Uganda (268); Kenya (234); Rwanda (184); Democratic Republic of Congo (DRC; 177); Madagascar (186); Mozambique (82). The vast majority of these genotypes do not exist within a formal germplasm conservation initiative and were derived from farmers' fields and National Agricultural Research Systems breeding programmes. Genotypes were assayed using 26 simple sequence repeat markers. Moderate genetic variation was observed with evidence of a genetic bottleneck in the region. Some differentiation was observed among countries in both cultivars and landraces. Euclidean distance revealed the pivotal position of Tanzanian landraces in the region, and STRUCTURE analysis revealed subtle and fairly complex relationships among cultivars and among landraces and cultivars analysed together. This is likely to reflect original germplasm introductions, gene flow including farmer exchanges, disease pandemics, past breeding programmes and the introduction of cultivars from the International Institute of Tropical Agriculture – Nigeria. Information generated from this study will be useful to justify and guide a regional cassava genetic resource conservation strategy, to identify gaps in cassava diversity in the region and to guide breeding strategies.
    https://dx.doi.org/10.1017/S1479262113000014
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1204
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1017/S1479262113000014
    IITA Subjects
    Cassava
    Agrovoc Terms
    Cassava; Genetic Variation; Simple Sequence Repeats
    Regions
    Africa; East Africa; Southern Africa
    Countries
    Tanzania; Mozambique; Rwanda; Congo, Dr
    Journals
    Plant Genetic Resources
    Collections
    • Journal and Journal Articles4835
    copyright © 2019  IITASpace. All rights reserved.
    IITA | Open Access Repository