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    Molecular markers associated with aluminium tolerance in Sorghum bicolor

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    Date
    2018
    Author
    Too, Emily Jepkosgei
    Anders S. Carlsson
    Were, Beatrice Ang’iyo
    Gudu, Samuel
    Onkware, Augustino
    Mulatu, Geleta
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    Abstract
    Background: Sorghum (Sorghum bicolor, L. Moench) production in many agro-ecologies is constrained by a variety of stresses, including high levels of aluminium (Al) commonly found in acid soils. Therefore, for such soils, growing Al tolerant cultivars is imperative for high productivity. Methods: In this study, molecular markers associated with Al tolerance were identified using a mapping population developed by crossing two contrasting genotypes for this trait. Results: Four SSR (Xtxp34, Sb5_236, Sb6_34, and Sb6_342), one STS (CTG29_3b) and three ISSR (811_1400, 835_200 and 884_200) markers produced alleles that showed significant association with Al tolerance. CTG29_3b, 811_1400, Xtxp34 and Sb5_236 are located on chromosome 3 with the first two markers located close to AltSB, a locus that underlie the Al tolerance gene (SbMATE) implying that their association with Al tolerance is due to their linkage to this gene. Although CTG29_3b and 811_1400 are located closer to AltSB, Xtxp34 and Sb5_236 explained higher phenotypic variance of Al tolerance indices. Markers 835_200, 884_200, Sb6_34 and Sb6_342 are located on different chromosomes, which implies the presence of several genes involved in Al tolerance in addition to SbMATE in sorghum. Conclusion: These molecular markers have a high potential for use in breeding for Al tolerance in sorghum. Keywords: Aluminium tolerance, Mapping population, Molecular markers, Net root length in aluminium, Sorghum bicolor
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    http://repository.rongovarsity.ac.ke/handle/123456789/737
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    • School of Agriculture, Natural Resources and Environmental Studies [137]

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