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    Genetic divergence in two tropical maize composites after four cycles of reciprocal recurrent selection

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    U17ArtKolawoleGeneticInthomDev.pdf (539.8Kb)
    Date
    2017
    Author
    Kolawole, A.O.
    Menkir, A.
    Gedil, M.
    Blay, E.
    Ofori, K.
    Kling, J.G.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Two tropical maize composites were subjected to four cycles of reciprocal recurrent selection to develop divergent inbred lines with good combining ability. This study was conducted to examine the extent of genetic diversity, changes in allele composition and genetic structure, of 100 randomly selected S1 lines each from the original (C0) and advanced (C4) selection cycles of TZL COMP3 and TZL COMP4, genotyped using single nucleotide polymorphism (SNP) markers. Results revealed that the proportion of alleles at both low and high frequencies decreased from C0 to C4, whereas those at intermediate frequencies increased at C4 in the two composites. More unique and other alleles were lost at C4 in TZL COMP3 relative to those in TZL COMP4. The changes in different measures of genetic diversity were either small or negligible with selection in the two composites. The proportion of markers departing from Hardy–Weinberg equilibrium (HWE) decreased with selection, whereas the total number of pairs of markers in linkage disequilibrium increased with selection in the two composites. Examination of changes in population structures using a model-based approach as well as cluster and multivariate analyses found a high degree of concordance in stratifying the 400 S1 lines into four non-overlapping groups corresponding to the two selection cycles each within the reciprocal composites. The observed molecular-based divergence between cycles within the same composite and the clear differentiation between the complementary composites highlight the importance of reciprocal recurrent selection for preserving genetic diversity for long-term selection. This increases the potential of the advanced selection cycles to sustain genetic gain in productivity of hybrids adapted to the savannas in West and Central Africa.
    https://dx.doi.org/10.1111/pbr.12439
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1587
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1111/pbr.12439
    IITA Subjects
    Genetic Improvement; Maize; Plant Genetic Resources
    Agrovoc Terms
    Maize; Genetic Variation; Hybrids; Genetic Structure; Oriented Populations; Single Nucleotide Polymorphism
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Plant Breeding
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    • Journal and Journal Articles4842
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