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    Combined linkage and association mapping reveal QTL for host plant resistance to common rust (Puccinia sorghi) in tropical maize

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    Date
    2018
    Author
    Zheng, H.
    Chen, J.
    Mu, C.
    Makumbi, Dan
    Xu, Y.
    Mahuku, George S.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Background Common rust, caused by Puccinia sorghi, is an important foliar disease of maize that has been associated with up to 50% grain yield loss. Development of resistant maize germplasm is the ideal strategy to combat P. sorghi. Results Association mapping performed using a mixed linear model (MLM), integrating population structure and family relatedness identified 25 QTL (P < 3.12 × 10− 5) that were associated with resistance to common rust and distributed on chromosomes 1, 3, 5, 6, 8, and 10. We identified three QTLs associated with all three disease parameters (final disease rating, mean disease rating, and area under disease progress curve) located on chromosomes 1, 3, and 8. A total of 5 QTLs for resistance to common rust were identified in the RIL population. Nine candidate genes located on chromosomes 1, 5, 6, 8, and 10 for resistance to common rust associated loci were identified through detailed annotation. Conclusions Using a diverse set of inbred lines genotyped with high density markers and evaluated for common rust resistance in multiple environments, it was possible to identify QTL significantly associated with resistance to common rust and several candidate genes. The results point to the need for fine mapping common rust resistance by targeting regions identified in common between this study and others using diverse germplasm.
    https://dx.doi.org/10.1186/s12870-018-1520-1
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5194
    Non-IITA Authors ORCID
    George Mahukuhttps://orcid.org/0000-0001-8444-8651
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1186/s12870-018-1520-1
    IITA Subjects
    Crop Husbandry; Genetic Improvement; Maize; Plant Diseases; Plant Genetic Resources
    Agrovoc Terms
    Puccinia Sorghi; Maize; Diseases; Quantitative Trait Loci; Germplasm
    Regions
    Africa; East Africa
    Countries
    Kenya
    Journals
    BMC Plant Biology
    Collections
    • Journal and Journal Articles4835
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