Genetic diversity and population structure of Urochloa grass accessions from Tanzania using simple sequence repeat (SSR) markers

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cg.authorship.typesCGIAR and developing country instituteen
cg.contributor.affiliationTanzania Livestock Research Instituteen
cg.contributor.affiliationInternational Livestock Research Instituteen
cg.contributor.crpLivestock
cg.contributor.donorDepartment of Foreign Affairs and Trade, Australiaen
cg.contributor.donorSyngenta Foundation for Sustainable Agricultureen
cg.contributor.donorBill & Melinda Gates Foundationen
cg.contributor.donorDepartment for International Development, United Kingdomen
cg.contributor.donorSwedish International Development Cooperation Agencyen
cg.coverage.countryTanzania
cg.coverage.iso3166-alpha2TZ
cg.coverage.regionAfrica
cg.coverage.regionEastern Africa
cg.coverage.regionSouthern Africa
cg.creator.identifierJean Hanson: 0000-0002-3648-2641
cg.creator.identifierSita Ghimire: 0000-0001-8930-1384
cg.creator.identifierAppolinaire Djikeng: 0000-0001-9271-3419
cg.howPublishedFormally Publisheden
cg.identifier.doihttps://doi.org/10.1007/s40415-018-0482-8en
cg.isijournalISI Journalen
cg.issn1806-9959en
cg.issue3en
cg.journalBrazilian Journal of Botanyen
cg.reviewStatusPeer Reviewen
cg.subject.ilriANIMAL FEEDINGen
cg.subject.ilriCROP-LIVESTOCKen
cg.subject.ilriCROPSen
cg.subject.ilriFEEDSen
cg.subject.ilriFORAGESen
cg.subject.ilriLIVESTOCKen
cg.volume41en
dc.contributor.authorKuwi, S.O.en
dc.contributor.authorKyallo, Martina M.en
dc.contributor.authorMutai Collins, K.en
dc.contributor.authorMwilawa, A.en
dc.contributor.authorHanson, Jeanen
dc.contributor.authorDjikeng, Appolinaireen
dc.contributor.authorGhimire, Sita R.en
dc.date.accessioned2018-09-07T13:20:50Zen
dc.date.available2018-09-07T13:20:50Zen
dc.identifier.urihttps://hdl.handle.net/10568/97092
dc.titleGenetic diversity and population structure of Urochloa grass accessions from Tanzania using simple sequence repeat (SSR) markersen
dcterms.abstractUrochloa (syn.—Brachiaria s.s.) is one of the most important tropical forages that transformed livestock industries in Australia and South America. Farmers in Africa are increasingly interested in growing Urochloa to support the burgeoning livestock business, but the lack of cultivars adapted to African environments has been a major challenge. Therefore, this study examines genetic diversity of Tanzanian Urochloa accessions to provide essential information for establishing a Urochloa breeding program in Africa. A total of 36 historical Urochloa accessions initially collected from Tanzania in 1985 were analyzed for genetic variation using 24 SSR markers along with six South American commercial cultivars. These markers detected 407 alleles in the 36 Tanzania accessions and 6 commercial cultivars. Markers were highly informative with an average polymorphic information content of 0.79. The analysis of molecular variance revealed high genetic variation within individual accessions in a species (92%), fixation index of 0.05 and gene flow estimate of 4.77 showed a low genetic differentiation and a high level of gene flow among populations. An unweighted neighbor-joining tree grouped the 36 accessions and six commercial cultivars into three main clusters. The clustering of test accessions did not follow geographical origin. Similarly, population structure analysis grouped the 42 tested genotypes into three major gene pools. The results showed the Urochloa brizantha (A. Rich.) Stapf population has the highest genetic diversity (I = 0.94) with high utility in the Urochloa breeding and conservation program. As the Urochloa accessions analyzed in this study represented only 3 of 31 regions of Tanzania, further collection and characterization of materials from wider geographical areas are necessary to comprehend the whole Urochloa diversity in Tanzania.en
dcterms.accessRightsOpen Access
dcterms.audienceScientistsen
dcterms.available2018-07-24
dcterms.bibliographicCitationKuwi, S.O., Kyalo, M., Mutai, C.K., Mwilawa, A., Hanson, J., Djikeng, A. and Ghimire, S.R. 2018. Genetic diversity and population structure of Urochloa grass accessions from Tanzania using simple sequence repeat (SSR) markers. Brazilian Journal of Botany 41(3):699–709.en
dcterms.extentp. 699-709en
dcterms.issued2018-09
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherSpringeren
dcterms.subjectcropsen
dcterms.subjectforageen
dcterms.subjectmixed farmingen
dcterms.subjectlivestocken
dcterms.typeJournal Article

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