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    Mapping QTLs for tolerance to salt stress at the early seedling stage in rice (Oryza sativa L.) using a newly identified donor ‘Madina Koyo’

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    Journal Article (3.686Mb)
    Date
    2020
    Author
    Amoah, N.K.A.
    Akromah, R.
    Kena, A.W.
    Manneh, B.
    Dieng, I.
    Bimpong, I.K.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Salt stress is a menace to rice production and a threat to food security worldwide. We evaluated 308 F4 families from Sahel 317/Madina Koyo for tolerance to salt stress at the early seedling stage. To better understand genomic regions controlling tolerance in the population, we genotyped the progenies and the two parents using single nucleotide polymorphism (SNP) markers and regressed the genotypic data on their phenotype to detect QTLs. An average reduction of 63.4% was observed for all fitness-related traits among the F4 families. A total of 46 progenies recorded an average salt injury score (SIS) between 1–3 and were rated as tolerant to salt stress at the early seedling stage. A high-density genetic map was constructed for the 12 rice chromosomes using 3698 SNP markers. Multiple interval mapping identified 13 QTLs for SIS, shoot length, shoot dry weight and root length on chromosomes 2, 3, 4, 6, 7, 10 and 12, with trait increasing alleles coming from both parents. Two (qSDW2 and qRL2.2) and three (qSL2, qRL2.1 and qSIS2) QTLs at different regions on chromosome 2 and another two on chromosome 7 (qSDW7 and qSL7) were tightly linked. These QTLs could facilitate breeding for salt tolerance at the early seedling stage as direct selection for one, would mean indirectly selecting for the other. Fine mapping of these novel QTLs in a different genetic background is necessary to confirm their stability and usefulness in breeding for tolerance to salinity in rice.
    https://dx.doi.org/10.1007/s10681-020-02689-5
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7754
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s10681-020-02689-5
    IITA Subjects
    Agronomy; Crop Systems; Grain Legumes; Plant Breeding; Plant Production
    Agrovoc Terms
    Rice; Seedlings; Osmotic Stress; Nucleotide Sequence; Quantitative Trait Loci
    Regions
    Africa; West Africa
    Countries
    Cote d’Ivoire (Ivory Coast)
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Euphytica
    Collections
    • Journal and Journal Articles4835
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