Chloroplast DNA (cp) and nuclear ribosomal DNA (rDNA) variation was investigated in 45 accessions of cultivated and wild Manihot species. Ten independent mutations, 8 point mutations and 2 length mutations were identified, using eight restriction enzymes and 12 heterologous cpDNA probes from mung...
Fregene, Martin A.
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Vargas, J.
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Ikea, J.
,
Angel, F.
,
Thome, J.
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Asiedu, Robert
,
Akoroda, M.O.
,
Roca, W.
,
[Variability of chloroplast DNA and nuclear ribosomal DNA in cassava (Manihot esculenta Crantz) and its wild relatives]
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Variability of chloroplast DNA and nuclear ribosomal DNA in cassava (Manihot esculenta Crantz) and its wild relatives
The aim of the Integrated Cassava Project (ICP) of the International Institute of Tropical Agriculture was to pre-emptively manage the cassava mosaic disease (CMD) to avert an imminent and increasing possible threat of the Ugandan strain of the CMD virus of the pathogen from doing damage to the N...
Dixon, A.
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Akoroda, M.O.
,
Okechukwu, R.U.
,
Ogbe, F.
,
Ilona, P.
,
Sanni, L.O.
,
Ezedinma, C.
,
Lemchi, J.
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Ssemakula, G.N.
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Yomeni, M.
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Okoro, E.
,
Tarawali, G.
,
[Fast track participatory approach to release of elite cassava genotypes for various uses in Nigerias cassava economy]
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Fast track participatory approach to release of elite cassava genotypes for various uses in Nigerias cassava economy
Cassava mosaic disease (CMD) caused by a group of begomoviruses and transmitted by whitefly vector is a serious disease in all the cassava-growing areas of Africa. Field evaluation with replication was conducted in 2003 and 2004 in three agroecologies in Nigeria to study the response of 40 cassav...
Egesi, Chiedozie N.
,
Ogbe, F.O.
,
Akoroda, M.O.
,
Ilona, P.
,
Dixon, A.
,
[Resistance profile of improved cassava germplasm to cassava mosaic disease in Nigeria]
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Resistance profile of improved cassava germplasm to cassava mosaic disease in Nigeria
The identification of superior genotypes and mega-environments on the basis of multiple traits is a key objective of multi-environment trials in cassava (Manihot esculenta Crantz). The objective of this study was to examine the genetic variation and genotype 3 environment interaction (GEI) effect...
Egesi, Chiedozie N.
,
Ilona, P.
,
Ogbe, F.O.
,
Akoroda, M.O.
,
Dixon, A.
,
[Genetic variation and genotype X environment interaction for yield and other agronomic traits in cassava in Nigeria]
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Genetic variation and genotype X environment interaction for yield and other agronomic traits in cassava in Nigeria
Cassava improvement research at the International Institute of Tropical Agriculture (I1TA) developed several new varieties during 1976-1985 that entered into the cassava culture of Oyo State of Nigeria where IITA is situated. The focus of this study was to determine the level of overall impact of...
Akoroda, M.O.
,
Gebremeskel, T.
,
Oyinlola, A.
,
[Impact of IITA cassava varieties in Oyo State, Nigeria, 19761985]
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Impact of IITA cassava varieties in Oyo State, Nigeria, 19761985
In 2004 and 2005 through field trials in over 2500 locations in several agroecological zones, 40 new cassava varieties were introduced in Nigeria. The trials were managed by scientists, extension workers and farmers. The aim in introducing these new varieties was to pre-emptively manage cassava m...
Okechukwu, R.U.
,
Dixon, Alfred G.O.
,
Akoroda, M.O.
,
Mwangi, M.
,
Bandyopadhyay, Ranajit
,
[Root rot resistance in new cassava varieties introduced to farmers in Nigeria]
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Root rot resistance in new cassava varieties introduced to farmers in Nigeria
Investigations were conducted on the identification and distribution of yam natural pollinators, flowering pattern and hybridization of white yam (Dioscorea rotundata Poir.) at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, in order to provide informations for produc...
Segnou, M.
,
Fatokun, C.
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Akoroda, M.O.
,
Hahn, S.
,
[Studies on the reproductive biology of white yam (Dioscorea rotundata Poir.)]
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Studies on the reproductive biology of white yam (Dioscorea rotundata Poir.)
Treatment with indolebutyric acid (IBA) significantly increased the number of roots produced by vine cuttings of ten Dioscorea rotundata cultivars. Some cultivars could be propagated by layering, especially with IBA treatment, but layering does not appear to be feasible for use on farms.
Acha, I.A.
,
Shiwachi, H.
,
Asiedu, Robert
,
Akoroda, M.O.
,
[Effect of auxins on root development in yam (Dioscorea rotundata) vine]
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Effect of auxins on root development in yam (Dioscorea rotundata) vine
Cassava mosaic disease (CMD), caused by different species of cassava mosaic geminiviruses (CMGs), is themost important disease of cassava in Africa and the Indian sub-continent. The cultivated cassava speciesis protected from CMD by polygenic resistance introgressed from the wild species Manihot ...
Oloyede-Kamiyo, Q.
,
Ajala, S.
,
Akoroda, M.O.
,
[Estimates of genetic variances and relationship among traits associated with stem borer resistance in maize (Zea mays L.)]
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Estimates of genetic variances and relationship among traits associated with stem borer resistance in maize (Zea mays L.)
Cassava production and utilization in Cameroon have undergone a long evolution. The post-independenceand pre-1990 eras were marked by activities that considered cassava to be a subsistence food crop. Duringthis period, farmers relied on coffee and cocoa as the major cash crops. Cassava growers us...
Ngeve, J.M.
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Tenku, S.N.
,
Dixon, Alfred G.O.
,
Whyte, J.B.A.
,
Okechukwu, R.U.
,
Hanna, R.
,
Akoroda, M.O.
,
[Boilable cassava varieties: what is their role within the context of the global agricultural economy?]
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Boilable cassava varieties: what is their role within the context of the global agricultural economy?