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    Genetic gains in yield and yield related traits under drought stress and favorable environments in a maize population improved using marker assisted recurrent selection

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    U17ArtBankoleGeneticInthomDev.pdf (265.6Kb)
    Date
    2017-05-17
    Author
    Bankole, F.
    Menkir, A.
    Olaoye, G.
    Crossa, J.
    Hearne, S.
    Unachukwu, N.N.
    Gedil, M.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    The objective of marker assisted recurrent selection (MARS) is to increase the frequency of favorable marker alleles in a population before inbred line extraction. This approach was used to improve drought tolerance and grain yield (GY) in a biparental cross of two elite drought tolerant lines. The testcrosses of randomly selected 50 S1 lines from each of the three selection cycles (C0, C1, C2) of the MARS population, parental testcrosses and the cross between the two parents (F1) were evaluated under drought stress (DS) and well watered (WW) well as under rainfed conditions to determine genetic gains in GY and other agronomic traits. Also, the S1 lines derived from each selection types were genotyped with single nucleotide polymorphism (SNP) markers. Testcrosses derived from C2 produced significantly higher grain field under DS than those derived from C0 with a relative genetic gain of 7% per cycle. Also, the testcrosses of S1 lines from C2 showed an average genetic gain of 1% per cycle under WW condition and 3% per cycle under rainfed condition. Molecular analysis revealed that the frequency of favorable marker alleles increased from 0.510 at C0 to 0.515 at C2, while the effective number of alleles (Ne) per locus decreased from C0 (1.93) to C2 (1.87). Our results underscore the effectiveness of MARS for improvement of GY under DS condition.
    https://doi.org/10.3389/fpls.2017.00808
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1897
    Digital Object Identifier (DOI)
    https://doi.org/10.3389/fpls.2017.00808
    Research Themes
    BIOTECH & PLANT BREEDING
    IITA Subjects
    Genetic Improvement; Maize; Plant Breeding; Plant Diseases; Plant Genetic Resources
    Agrovoc Terms
    Maize; Genetic Gain; Drought Tolerance; Allele Frequency; Marker Assisted Recurrent Selection; Genotypes; Breeding; Dna; Testcrosses; Phenotypic
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Frontiers in Plant Science
    Collections
    • Journal and Journal Articles5283
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