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    Identifying new resistance to Cassava Mosaic Disease and validating markers for the CMD2 locus

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    Journal Article (2.078Mb)
    Date
    2021
    Author
    Thuy, C.T.L.
    Lopez-Lavalle, L.A.
    Vu, N.A.
    Hy, N.H.
    Nhan, P.T.
    Ceballos, H.
    Newby, J.
    Tung, N.B.
    Hein, N.T.
    Tuan, L.N.
    Hung, N.
    Hanh, N.T.
    Trang, D.T.
    Ha, P.T.T.
    Ham, L.H.
    Pham, X.H.
    Quynh, D.T.N.
    Rabbi, I.Y.
    Kulakow, P.
    Zhang, X.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Cassava (Manihot esculenta Crantz) is a crucial staple crop, and provides carbohydrate energy to more than half a billion people in the tropics. Cassava mosaic disease (CMD) is the most important disease of cassava in Africa. Since Sri Lanka Cassava Mosaic Virus (SLCMV) was first reported in South East Asia in 2015, establishing sustainable solutions to CMD has become a top priority for the cassava program at the International Center for Tropical Agriculture (CIAT) and its partners. In the present study, we screened two populations for CMD resistance: VNM142, 142 clones collected from farms throughout Vietnam, and CIAT102, 102 clones resistant to CMD or mites, which were introduced from CIAT. High broad-sense heritability was observed in all the trials (>0.80). From the population VNM142, eight clones showed high CMD resistance with CMD severity scores less than 2.0. Two resistant clones had the same DNA fingerprinting with the accessions CR63 (PER262 or TAI9) and KM57 (VNM8) in the genebank, respectively. To our knowledge, this is the first report of CMD resistance in the genebank at CIAT. We also used the two populations to validate the CMD markers S12_7926132 and S14_4626854. Both markers explained 51% of the population variance in the segregating population CIAT102, but only 11% in the diverse population VNM142. Thus, we concluded that the two CMD markers could not be used to select for CMD resistance in diverse populations, but could predict the CMD resistance in segregating populations when the susceptible parents do not have resistant marker alleles and the resistance of the CMD2 donors is confirmed.
    https://dx.doi.org/10.3390/agriculture11090829
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7387
    IITA Authors ORCID
    Ismail Rabbihttps://orcid.org/0000-0001-9966-2941
    Peter Kulakowhttps://orcid.org/0000-0002-7574-2645
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.3390/agriculture11090829
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Cassava; Food Security; Plant Breeding; Plant Diseases; Plant Health; Plant Production
    Agrovoc Terms
    Cassava; Diseases; Plant Diseases; Marker-Assisted Selection
    Regions
    Asia; Southeast Asia
    Countries
    Vietnam
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Agriculture
    Collections
    • Journal and Journal Articles4835
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