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    Genetic structure and origin of Busseola fusca (Fuller) (Lepidoptera, Noctuidae) populations in Cameroon

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    Authors
    Sezonlin, M.
    Ndemah, R.
    Goergen, Georg E.
    Le Rü, B.
    Dupas, S.
    Silvain, J.
    Date
    2012-11
    Language
    en
    Type
    Journal Article
    Review status
    Peer Review
    ISI journal
    Accessibility
    Limited Access
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    Citation
    Sezonlin, M., Ndemah, R., Goergen, G., Le Rü, B., Dupas, S. & Silvain, J. (2012). Genetic structure and origin of Busseola fusca populations in Cameroon. Entomologia Experimentalis et Applicata, 145(2), 143-152.
    Permanent link to cite or share this item: https://hdl.handle.net/10568/80844
    DOI: http://dx.doi.org/10.1111/j.1570-7458.2012.01319.x
    Abstract/Description
    The cereal stem borer Busseola fusca Fuller (Lepidoptera: Noctuidae) is a species endemic to sub-Saharan Africa. It is amajor pest ofmaize and cultivated sorghum, the main cereal crops on the African mainland. Previous studies using mitochondrial markers revealed the presence of three clades of haplotypes (W, KI, KII) among B. fusca populations. Previous preliminary studies based on a few B. fusca individuals collected fromthree localities within the Guineo-Congolian rain forest in Cameroon demonstrated a matching with clade KII, a fairly surprising result because the putative centre of origin of that clade is located 3 000 km away in East Africa. To check this finding, 120 individuals of B. fusca covering several Cameroonian sites belonging to both Guineo-Congolian rain forest and Afromontane vegetation mosaics were collected. Comparison of cytochrome b sequences using the samemarker revealed low mitochondrial diversity (h = 0.483 ± 0.054, p = 0.073 ± 0.061%).Moreover, molecular diversity in the Guineo-Congolian rain forest zone was lower than that in Afromontane vegetation, which is therefore thought to be the likely starting point for the colonization of other zones in Cameroon. The study showed a moderate but significant structuring between populations (ΦST = 0.034, P<0.001) as well as within and among the two Cameroonian phytogeographical groups considered (ΦSC = 0.000 and ΦCT = 0.051, respectively, both P<0.001). Nested clade phylogeographic analysis indicated that all Cameroonian clades with significant geographical associations were interpreted as a phenomenon of contiguous range expansion. All results suggest that the Cameroonian population of B. fusca is relatively recent and originates from the recent geographical expansion of clade KII.
    CGIAR Affiliations
    Integrated Systems for the Humid Tropics
    AGROVOC Keywords
    MAIZE STALK BORER; POPULATION GENETICS; MITOCHONDRIAL HAPLOTYPE; CLADE; CENTRAL AND EAST AFRICA; LEPIDOPTERA; NOCTUIDAE
    Subjects
    PESTS OF PLANTS; MAIZE
    Countries
    CAMEROON
    Regions
    AFRICA; WEST AFRICA
    Investors/sponsors
    International Foundation for Science
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