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    Assessment of genetic diversity among African cassava Manihot esculenta Grantz accessions resistant to the cassava mosaic virus disease using SSR markers

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    Date
    2006
    Author
    Lokko, Y.
    Dixon, A.
    Offei, S.
    Danquah, E.Y.
    Fregene, M.
    Type
    Journal Article
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    Abstract/Description
    A study was conducted to determine the extent of genetic diversity among African cassava (Manihot esculenta Crantz) accessions resistant to the cassava mosaic virus disease (CMD), using simple sequence repeat (SSR) markers. The accessions included a breeding stock (clone 58308), five improved lines, 62 CMD resistant and 10 CMD susceptible landraces. Genetic diversity was assessed among accessions in five cluster groups derived from UPGMA analysis on data from 18 SSR primer pairs. Average gene diversity, He, was high in all cluster groups, with an average heterozygosity of 0.591 ± 0.061. The estimator of inbreeding Fis revealed a low level of inbreeding within groups and averaged −0.262 ± 0.142. Gene diversity among all accessions was 51.4% and gene diversity within cluster groups was 46.6%, while 4.8% was due to diversity between the different cluster groups. The amount of genetic differentiation measured by Gst and Fst were 9.6% and 12.1% respectively, indicating a weak genetic structure.
    http://dx.doi.org/10.1007/s10722-005-6841-x
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3044
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.1007/s10722-005-6841-x
    IITA Subjects
    Plant Genetic Resources; Disease Control; Farm Management; Pests Of Plants; Plant Breeding; Livelihoods; Cassava; Genetic Improvement; Farming Systems; Handling, Transport, Storage And Protection Of Agricultural Products; Plant Diseases; Plant Health; Plant Production
    Agrovoc Terms
    African Cassava Mosaic Virus; Genetic Variation; Manihot Esculenta; Sources Of Resistance; Simple Sequence Repeat; Cluster Groups; African Cassava Mosaic Virus; East African Cassava Mosaic Virus
    Regions
    Africa; Acp; West Africa; South America
    Countries
    Nigeria; Ghana; Colombia
    Collections
    • Journal and Journal Articles4835

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