Genetic diversity and population structure of cowpea [Vigna unguiculata (L.)Walp.] germplasm collected from Togo based on DArT markers

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dc.creatorGbedevi, K.M.
dc.creatorBoukar, O.
dc.creatorIshikawa, H.
dc.creatorAbe, A.
dc.creatorOngom, P.O.
dc.creatorUnachukwu, N.
dc.creatorRabbi, I.Y.
dc.creatorFatokun, C.
dc.date2021
dc.date2021-10-29T10:52:57Z
dc.date2021-10-29T10:52:57Z
dc.date.accessioned2026-06-27T15:57:45Z
dc.descriptionCrop genetic diversity is a sine qua non for continuous progress in the development of improved varieties, hence the need for germplasm collection, conservation and characterization. Over the years, cowpea has contributed immensely to the nutrition and economic life of the people in Togo. However, the bulk of varieties grown by farmers are landraces due to the absence of any serious genetic improvement activity on cowpea in the country. In this study, the genetic diversity and population structure of 255 cowpea accessions collected from five administrative regions and the agricultural research institute of Togo were assessed using 4600 informative diversity array technology (DArT) markers. Among the regions, the polymorphic information content (PIC) ranged from 0.19 to 0.27 with a mean value of 0.25. The expected heterozygosity (He) varied from 0.22 to 0.34 with a mean value of 0.31, while the observed heterozygosity (Ho) varied from 0.03 to 0.07 with an average of 0.05. The average inbreeding coefficient (FIS) varied from 0.78 to 0.89 with a mean value of 0.83, suggesting that most of the accessions are inbred. Cluster analysis and population structure identified four groups with each comprising accessions from the six different sources. Weak to moderate differentiation was observed among the populations with a genetic differentiation index varying from 0.014 to 0.117. Variation was highest (78%) among accessions within populations and lowest between populations (7%). These results revealed a moderate level of diversity among the Togo cowpea germplasm. The findings of this study constitute a foundation for genetic improvement of cowpea in Togo.
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/115740
dc.identifier.urihttp://hdl.handle.net/123456789/118645
dc.languageen
dc.publisherMDPI
dc.rightsOpen Access
dc.sourceGbedevi, K.M., Boukar, O., Ishikawa, H., Abe, A., Ongom, P.O., Unachukwu, N., ... & Fatokun, C. (2021). Genetic diversity and population structure of cowpea [Vigna unguiculata (L.)Walp.] germplasm collected from Togo based on DArT markers. Genes, 12(9), 1451: 1-14.
dc.subjectcowpeas
dc.subjectvigna unguiculata
dc.subjectgermplasm
dc.subjectgenetic diversity
dc.subjectpopulation structure
dc.subjectgenetic markers
dc.subjecttogo
dc.titleGenetic diversity and population structure of cowpea [Vigna unguiculata (L.)Walp.] germplasm collected from Togo based on DArT markers
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)