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    Variability of chloroplast DNA and nuclear ribosomal DNA in cassava (Manihot esculenta Crantz) and its wild relatives

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    Date
    1994
    Author
    Fregene, M.
    Vargas, J.
    Ikea, J.
    Angel, F.
    Thome, J.
    Asiedu, Robert
    Akoroda, M.
    Roca, W.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Chloroplast DNA (cp) and nuclear ribosomal DNA (rDNA) variation was investigated in 45 accessions of cultivated and wild Manihot species. Ten independent mutations, 8 point mutations and 2 length mutations were identified, using eight restriction enzymes and 12 heterologous cpDNA probes from mungbean. Restriction fragment length polymorphism analysis defined nine distinct chloroplast types, three of which were found among the cultivated accessions and six among the wild species. Cladistic analysis of the cpDNA data using parsimony yielded a hypothetical phylogeny of lineages among the cpDNAs of cassava and its wild relatives that is congruent with morphological evolutionary differentiation in the genus. The results of our survey of cpDNA, together with rDNA restriction site change at the intergenic spacer region and rDNA repeat unit length variation (using rDNA cloned fragments from taro as probe), suggest that cassava might have arisen from the domestication of wild tuberous accessions of some Manihot species, followed by intensive selection. M. esculenta subspp flabellifolia is probably a wild progenitor. Introgressive hybridization with wild forms and pressures to adapt to the widely varying climates and topography in which cassava is found might have enhanced the crop's present day variability.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5577
    IITA Subjects
    Food Security; Cassava; Value Chains; Plant Production; Plant Breeding
    Agrovoc Terms
    Cassava; Dna; Yields; Hybridization
    Regions
    Africa; Acp; West Africa; South America
    Countries
    Nigeria; Colombia
    Collections
    • Journal and Journal Articles5286
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