Genetic diversity of cassava (Manihot esculenta Crantz) landraces and cultivars from southern, eastern and central Africa

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cg.authorship.typesCGIAR and developing country instituteen
cg.contributor.affiliationNational Crops Resources Research Institute, Ugandaen
cg.contributor.affiliationUniversity of the Free Stateen
cg.contributor.affiliationInternational Institute of Tropical Agricultureen
cg.contributor.affiliationInternational Livestock Research Instituteen
cg.contributor.affiliationInstitut National pour l'Étude et la Recherche Agronomiques, Democratic Republic of Congoen
cg.contributor.affiliationInstitut des Sciences Agronomiques du Rwandaen
cg.contributor.affiliationNaliendele Agricultural Research Institute, Tanzaniaen
cg.contributor.affiliationKenya Agricultural Research Instituteen
cg.contributor.affiliationInstituto de Investigação Agrária de Moçambiqueen
cg.contributor.crpRoots, Tubers and Bananas
cg.coverage.countryTanzania
cg.coverage.countryMozambique
cg.coverage.countryRwanda
cg.coverage.countryCongo, Democratic Republic of
cg.coverage.iso3166-alpha2TZ
cg.coverage.iso3166-alpha2MZ
cg.coverage.iso3166-alpha2RW
cg.coverage.iso3166-alpha2CD
cg.coverage.regionAfrica
cg.coverage.regionEastern Africa
cg.coverage.regionSouthern Africa
cg.coverage.regionMiddle Africa
cg.howPublishedFormally Publisheden
cg.identifier.doihttps://doi.org/10.1017/s1479262113000014en
cg.isijournalISI Journalen
cg.issn1479-2621en
cg.issue02en
cg.journalPlant Genetic Resourcesen
cg.reviewStatusPeer Reviewen
cg.subject.iitaCASSAVAen
cg.volume11en
dc.contributor.authorKawuki, Robert S.en
dc.contributor.authorHerselman, L.en
dc.contributor.authorLabuschagne, Maryke T.en
dc.contributor.authorNzuki, I.en
dc.contributor.authorRalimanana, I.en
dc.contributor.authorBidiaka, M.en
dc.contributor.authorKanyange, M.C.en
dc.contributor.authorGashaka, G.en
dc.contributor.authorMasumba, E.en
dc.contributor.authorMkamilo, G.S.en
dc.contributor.authorGethi, J.en
dc.contributor.authorWanjala, Bramwel W.en
dc.contributor.authorZacarias, A.en
dc.contributor.authorMadabula, F.en
dc.contributor.authorFerguson, M.en
dc.date.accessioned2016-08-12T06:27:26Zen
dc.date.available2016-08-12T06:27:26Zen
dc.identifier.urihttps://hdl.handle.net/10568/76410
dc.titleGenetic diversity of cassava (Manihot esculenta Crantz) landraces and cultivars from southern, eastern and central Africaen
dcterms.abstractStudies to quantify genetic variation in cassava germplasm, available within the national breeding programmes in Africa, have been limited. Here, we report on the nature and extent of genetic variation that exists within 1401 cassava varieties from seven countries: Tanzania (270 genotypes); Uganda (268); Kenya (234); Rwanda (184); Democratic Republic of Congo (DRC; 177); Madagascar (186); Mozambique (82). The vast majority of these genotypes do not exist within a formal germplasm conservation initiative and were derived from farmers' fields and National Agricultural Research Systems breeding programmes. Genotypes were assayed using 26 simple sequence repeat markers. Moderate genetic variation was observed with evidence of a genetic bottleneck in the region. Some differentiation was observed among countries in both cultivars and landraces. Euclidean distance revealed the pivotal position of Tanzanian landraces in the region, and STRUCTURE analysis revealed subtle and fairly complex relationships among cultivars and among landraces and cultivars analysed together. This is likely to reflect original germplasm introductions, gene flow including farmer exchanges, disease pandemics, past breeding programmes and the introduction of cultivars from the International Institute of Tropical Agriculture – Nigeria. Information generated from this study will be useful to justify and guide a regional cassava genetic resource conservation strategy, to identify gaps in cassava diversity in the region and to guide breeding strategies.en
dcterms.accessRightsLimited Access
dcterms.audienceScientistsen
dcterms.available2013-02-12
dcterms.bibliographicCitationKawuki, R. S., Herselman, L., Labuschagne, M., Nzuki, I., Ralimanana, I., Bidiaka, M., ... & Ferguson, M. (2013). Genetic diversity of cassava (Manihot esculenta Crantz) landraces and cultivars from southern, eastern and central Africa. Plant Genetic Resources 11(02):170-181.en
dcterms.extent170-181en
dcterms.issued2013-08
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherCambridge University Pressen
dcterms.subjectcassavaen
dcterms.subjectgenetic variationen
dcterms.subjectsimple sequence repeatsen
dcterms.typeJournal Article

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