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

dc.contributor.authorNorman, P.E.
dc.contributor.authorAsfaw, A.
dc.contributor.authorTongoona, P.B.
dc.contributor.authorDanquah, A.O.
dc.contributor.authorDanquah, E.Y.
dc.contributor.authorKoeyer, D. de
dc.contributor.authorAsiedu, Robert
dc.date.accessioned2019-12-04T11:18:27Z
dc.date.available2019-12-04T11:18:27Z
dc.date.issued2018
dc.identifier.citationNorman, P.E., Asfaw, A., Tongoona, P., Danquah, A., Danquah, E.Y., De Koeyer, D. & Asiedu, R. (2018). Pollination success in some white yam genotypes under polycross and nested mating designs. International Journal of Biological Sciences and Applications, 5(2), 19-28.
dc.identifier.issn2375-3811
dc.identifier.urihttps://hdl.handle.net/20.500.12478/3208
dc.descriptionPublished online: 10 March 2018
dc.description.abstractBreeding 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.
dc.description.sponsorshipInternational Development Research Centre
dc.description.sponsorshipBill & Melinda Gates Foundation
dc.format.extent19-28
dc.language.isoen
dc.subjectPollination
dc.subjectDioscorea Rotundata
dc.subjectMating Systems
dc.subjectReproduction
dc.subjectYam Breeding
dc.subjectGenotypes
dc.titlePollination success in some white yam genotypes under polycross and nested mating designs
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpRoots, Tubers and Bananas
cg.contributor.affiliationSierra Leone Agricultural Research Institute
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationUniversity of Ghana
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryNigeria
cg.creator.identifierAsrat Asfaw: 0000-0002-4859-0631
cg.creator.identifierDavid De Koeyer: 0000-0001-8064-6538
cg.creator.identifierRobert Asiedu: 0000-0001-8943-2376
cg.researchthemeBIOTECH & PLANT BREEDING
cg.identifier.urlhttp://www.aascit.org/journal/ijbsa
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectGenetic Improvement
cg.iitasubjectPlant Breeding
cg.iitasubjectPlant Genetic Resources
cg.iitasubjectYam
cg.journalInternational Journal of Biological Sciences and Applications
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access
local.dspaceid94855
cg.targetaudienceScientists


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