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    Identification of QTLs for grain yield and other traits in tropical maize under Striga infestation

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    Journal Article (1.251Mb)
    Date
    2020
    Author
    Badu-Apraku, B.
    Adewale, S.A.
    Agre, P.A.
    Gedil, M.
    Toyinbo, J.O.
    Asiedu, R.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Striga is an important biotic factor limiting maize production in sub-Saharan Africa and can cause yield losses as high as 100%. Marker-assisted selection (MAS) approaches hold a great potential for improving Striga resistance but requires identification and use of markers associated with Striga resistance for adequate genetic gains from selection. However, there is no report on the discovery of quantitative trait loci (QTL) for resistance to Striga in maize under artificial field infestation. In the present study, 198 BC1S1 families obtained from a cross involving TZEEI 29 (Striga resistant inbred line) and TZEEI 23 (Striga susceptible inbred line) plus the two parental lines were screened under artificial Striga-infested conditions at two Striga-endemic locations in Nigeria in 2018, to identify QTL associated with Striga resistance indicator traits, including grain yield, ears per plant, Striga damage and number of emerged Striga plants. Genetic map was constructed using 1,386 DArTseq markers distributed across the 10 maize chromosomes, covering 2076 cM of the total genome with a mean spacing of 0.11 cM between the markers. Using composite interval mapping (CIM), fourteen QTL were identified for key Striga resistance/tolerance indicator traits: 3 QTL for grain yield, 4 for ears per plant and 7 for Striga damage at 10 weeks after planting (WAP), across environments. Putative candidate genes which encode major transcription factor families WRKY, bHLH, AP2-EREBPs, MYB, and bZIP involved in plant defense signaling were detected for Striga resistance/tolerance indicator traits. The QTL detected in the present study would be useful for rapid transfer of Striga resistance/tolerance genes into Striga susceptible but high yielding maize genotypes using MAS approaches after validation. Further studies on validation of the QTL in different genetic backgrounds and in different environments would help verify their reproducibility and effective use in breeding for Striga resistance/tolerance.
    https://dx.doi.org/10.1371/journal.pone.0239205
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7721
    IITA Authors ORCID
    BAFFOUR BADU-APRAKUhttps://orcid.org/0000-0003-0113-5487
    Paterne AGREhttps://orcid.org/0000-0003-1231-2530
    Melaku Gedilhttps://orcid.org/0000-0002-6258-6014
    Robert Asieduhttps://orcid.org/0000-0001-8943-2376
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1371/journal.pone.0239205
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Maize; Plant Breeding; Plant Diseases; Plant Production
    Agrovoc Terms
    Maize; Food Security; Nutrition; Striga Hermonthica; Quantitative Trait Loci; Yields
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    PLOS ONE
    Collections
    • Journal and Journal Articles4835
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