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Dioscorea alata L. is a highly important crop, widely distributed in the humid and semi-humid tropics. Flow cytometry was used to determine the ploidy levels of 74 D. alata genotypes collected mainly from West African countries. Sixty three of the genotypes were found to be tetraploid, one was he...


Obidiegwu, J.E.Rodríguez, E.Ene-Obong, E.E.Loureiro, J.Muoneke, C.Santos, C.Kolesnikova-Allen, M.Asiedu, Robert[Ploidy levels of Dioscorea alata L. germplasm determined by flow cytometry]Ploidy levels of Dioscorea alata L. germplasm determined by flow cytometry

As part of a participatory selection programme, promising individual trees were selected in 2004 in cocoa farms of southern and western Cameroon regions for yield and for low incidence of Phytophthora pod rot (Ppr) caused by Phytophthora megakarya. The aim of this study was to compare the levels ...


Efombagn, M.I.B.Nyassé, S.Sounigo, O.Kolesnikova-Allen, M.Eskes, A.B.[Participatory cocoa (Theobroma cacao) selection in Cameroon: Phytophthora pod rot resistant accessions identified in farmers fields]Participatory cocoa (Theobroma cacao) selection in Cameroon: Phytophthora pod rot resistant accessions identified in farmers fields

The Guinea yams, Dioscorea cayenensis Lam. and D. rotundata Poir. (D. cayenensis–D. rotundata complex), represent a highly importantcrop, widely distributed in the humid and semi-humidtropics. The ploidy levels of 170 accessions of the core set of Guinea yams from West African coun...


Obidiegwu, J.E.Loureiro, J.Ene-Obong, E.E.Rodríguez, E.Kolesnikova-Allen, M.Santos, C.Muoneke, C.Asiedu, Robert[Ploidy level studies on the Dioscorea cayenensis/Dioscorea rotundata complex core set]Ploidy level studies on the Dioscorea cayenensis/Dioscorea rotundata complex core set

Yam (Dioscorea spp), a multi-species, polyploid, and vegetatively propagated tuber crop, is cultivated widely in the tropics and subtropics. Over 95% of the world's yam production occurs in West and Central Africa where white yam (Dioscorea rotundata Poir.) is the most important among cultivated ...


Otoo, E.Akromah, R.Kolesnikova-Allen, M.Asiedu, Robert[Delineation of pona complex of yam in Ghana using SSR markers]Delineation of pona complex of yam in Ghana using SSR markers

Incorrect labeling of cocoa accessions is a significant that has hindered the efficient conservation and use of cocoa germplasm. The United States Department of Agriculture (USDA), together with the international collaborating institutions, has undertaken a program to identify the cocoa genotypes...


Zhang, D.Boccara, MichelMischke, S.Motilal, L.Kolesnikova-Allen, M.Cryer, N.Turnbull, C.Lanaud, C.Philips-Mora, W.Butler, D.[Detection of mislabeled germplasm in cocoa collections using DNA fingerprinting with SSR markers]Detection of mislabeled germplasm in cocoa collections using DNA fingerprinting with SSR markers
Akoroda, M.O.Amegbeto, K.Asiedu, RobertAttey, A.N.Baah, F.Bakam, I.Bandyopadhyay, RanajitBoivin, M.Boons, P.Cornet, D.Coyne, D.L.David, S.Dixon, A.Dumet, D.Ezedinma, C.Gockowski, J.Goergen, Georg E.Gyamfi, I.Hanna, R.Halos-Kim, L.Hauser, S.Hughes, J.Kikuno, H.Kolesnikova-Allen, M.Legg, C.Legg, J.P.Lema, A.Lemchi, J.Lokko, Y.Makinde, K.Mahungu, N.M.Maroya, N.G.Maziya-Dixon, B.B.Mkumbira, J.Mva Mva, J.Mwangi, M.Nguimgo, B.Nielsen, O.Nkamleu, G.B.Nolte, C.Norgrove, L.Ogbe, F.Okafor, C.Okechukwu, R.Okoro, E.Patino, M.Sanni, L.O.Shiwachi, H.Ssemakula, G.N.Tarawali, G.Tenkouno, A.Tindo, M.Toko, M.Weise, S.F.Wendt, J.Yapo Assamoi, A.[Program E: Enhancing livelihoods in the humid and subhumid zones of West and Central Africa through profitable and sustainable intensification of diverse agricultural systems]Program E: Enhancing livelihoods in the humid and subhumid zones of West and Central Africa through profitable and sustainable intensification of diverse agricultural systems

Amegbeto, K.Asiedu, RobertBandyopadhyay, RanajitCarsky, R.Cherry, A.Chikoye, D.Cornet, D.Coyne, D.L.Dixon, Alfred G.O.Dury, S.Gockowski, J.Halos-Kim, L.Hanna, R.Hauser, S.Hughes, Jacqueline d'ArrosKolesnikova-Allen, M.Kormawa, P.M.Legg, C.Legg, J.P.Lemchi, J.Maroya, N.G.Maziya-Dixon, B.B.Moonan, F.Neuenschwander, P.Nkamleu, G.B.Nolte, C.Norgrove, L.Offer, S.Ogbe, F.Rueda, J.Shiwachi, H.Tenkouano, A.Tindo, M.Toko, M.Weise, S.F.Whyte, J.[Project E: enhancing livelihoods in the humid and subhumid zones of west and central Africa through profitable and sustainable intensification of diverse agricultural systems]Project E: enhancing livelihoods in the humid and subhumid zones of west and central Africa through profitable and sustainable intensification of diverse agricultural systems

Theobroma cacao L. with its center of diversity in Central and South America was first introduced to West Africa in the mid-19th century and today the region produces 70% of the world's cocoa. Several distinct cocoa types have been introduced, cultivated, and intercrossed across the region. Also,...


Opoku, S.Bhattacharjee, R.Kolesnikova-Allen, M.Motamayor, J.Schnell, R.Ingelbrecht, I.L.Enu-Kwesi, L.Adu-Ampomah, Y.[Genetic diversity in cocoa (Theobroma cacao L.) germplasm collection from Ghana]Genetic diversity in cocoa (Theobroma cacao L.) germplasm collection from Ghana

The genetic diversity of 219 accessions of Guinea yam germplasm from Benin, Congo, Côte d’ Ivoire,Equatorial Guinea, Gabon, Ghana, Nigeria, Sierra Leone and Togo was accessed using 15 microsatelliteloci. High diversity of 0.677 was found among the accessions. An allelic average of 8.06 andpolymor...


Obidiegwu, J.E.Kolesnikova-Allen, M.Ene-Obong, E.E.Muoneke, C.O.Asiedu, Robert[SSR markers reveal diversity in Guinea yam (Dioscorea cayenensis/D. rotundata) core set]SSR markers reveal diversity in Guinea yam (Dioscorea cayenensis/D. rotundata) core set

Nuclear DNA content of 54 accessions of 6 Dioscorea species collected from West African countries were determined using flow cytometry. Observed ploidy levels are diploid (2x), triploid (3x), tetraploid (4x), hexaploid (6x) and octoploid (8x). DNA index varied from 0.36 to 1.54 depending on the c...


Obidiegwu, J.E.Rodríguez, E.Ene-Obong, E.E.Loureiro, J.Muoneke, C.O.Santos, C.Kolesnikova-Allen, M.Asiedu, Robert[Estimation of the nuclear DNA content in some representative of genus Dioscorea]Estimation of the nuclear DNA content in some representative of genus Dioscorea

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