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    Pollination success in some white yam genotypes under polycross and nested mating designs

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    S18ArtNormanPollinationNothomDev.pdf (955.9Kb)
    Date
    2018
    Author
    Norman, P.E.
    Asfaw, A.
    Tongoona, P.B.
    Danquah, A.O.
    Danquah, E.Y.
    Koeyer, D. de
    Asiedu, Robert
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Breeding yams is a two-step process that combines sexual and asexual reproduction. Sexual reproduction involving a transfer of pollen from male to female genotype reproductive organ is a key step to generate variability in yam improvement. The efficacy of genetic improvement therefore depends on degree of pollination success resulting in fruit set and producing viable botanical seeds. This study assessed pollination success attributes in white yam (Dioscorea rotundata) genotypes using two mating designs: polycross and nested mating designs. Selected floral, fruit and seed traits were assessed in 12 parents (comprising nine females and three males) used in a polycross (natural) and nested (artificial hand pollination) mating designs. Total fruit sets and number of filled seeds were lower under nested mating compared to the polycross design. However, filled seeds per fruits were higher in nested mating than in polycross design. Fruiting success and number of flowers pollinated contributed more to the variability in filled seeds in polycross (R2=0.67; p<0.05) than nested mating (R2=0.40; p=0.301). Mean kinship (MK) values showed weak positive association with fruit set per plant in both NC-I (r=0.312) and polycross (r=0.05) designs. The relationship between flowering intensity and pollination success was high and positive in polycross (r=0.85), but low and negative in NC-I (r=-0.06). Genome uniqueness had weak association with fruit set success NC-I (r=0.23) and polycross (r= -0.014) designs. The results suggest complementarity of polycross and nested mating designs for optimizing population improvement and variety development in white yam breeding.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3208
    Non-IITA Authors ORCID
    Asrat Asfawhttps://orcid.org/0000-0002-4859-0631
    David De Koeyerhttps://orcid.org/0000-0001-8064-6538
    Robert Asieduhttps://orcid.org/0000-0001-8943-2376
    Research Themes
    BIOTECH & PLANT BREEDING
    IITA Subjects
    Genetic Improvement; Plant Breeding; Plant Genetic Resources; Yam
    Agrovoc Terms
    Pollination; Dioscorea Rotundata; Mating Systems; Reproduction; Yam Breeding; Genotypes
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    International Journal of Biological Sciences and Applications
    Collections
    • Journal and Journal Articles4836
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