Person: Oikeh, S.O.
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Oikeh
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S.O.
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Oikeh, S.O.
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- Performance of Bt maize event MON810 in controlling maize stem borers Chilo partellus and Busseola fusca in Uganda(Elsevier, 2022) Otim, M.; Alibu. S.; Asea, G.; Abalo, G.; Sserumaga, J.P.; Adumo, S.; Alupo, J.; Ochen, S.; Tadele Tefera; Bruce, A.Y.; Beyene, Y.; Meisel, B.; Tende, R.; Nang’ayo, F.; Baguma, Y.; Mugo, S.N.; Oikeh, S.O.
Publication - Genetic gains in grain yield through genomic selection in eight bi-parental maize populations under drought stress(CSSA, 2015) Beyene, Y.; Semagn, K.; Mugo, S.N.; Tarekegne, A.T.; Babu, R.; Meisel, B.; Sehabiague, P.; Makumbi, D.; Magorokosho, C.; Oikeh, S.O.; Gakunga, J.; Vargas Hernández, M.; Olsen, M.; Prasanna, B.M.; Banziger, M.; Crossa, J.
Publication - Evaluation of early-generation tropical maize testcrosses for grain-yield potential and weevil (Sitophilus zeamais Motschulsky) resistance(Elsevier, 2021) Sserumaga, J.P.; Makumbi, D.; Oikeh, S.O.; Otim, M.; Machida, L.; Bruce, A.Y.; Nhamucho, E.; Beyene, Y.; Mugo, S.N.
Publication - On-farm performance and farmers’ perceptions of DroughtTEGO-climate-smart maize hybrids in Kenya(American Society of Agronomy, 2019) Obunyali, C.O.; Karanja, J.; Oikeh, S.O.; Omanya, G.; Mugo, S.N.; Beyene, Y.; Oniang’o, R.
Publication - Performance and yield stability of maize hybrids in stress-prone environments in eastern Africa(Elsevier, 2020) Rezende, W.S.; Beyene, Y.; Mugo, S.N.; Ndou, E.; Gowda, M.; Sserumaga, J.P.; Asea, G.; Ismail Ngolinda; Jumbo, M.B; Oikeh, S.O.; Olsen, M.; Borem, A.; Cruz, C.D.; Prasanna, B.M.
Publication - Breeding WEMA maize for the African Continent(CIMMYT, 2018) Mugo, S.N.; Beyene, Y.; Ndou, E.; Oikeh, S.O.; Asea, G.; Mashingaidze, K.
Publication - Grain-yield stability among tropical maize hybrids derived from doubled-haploid inbred lines under random drought stress and optimum moisture conditions(CSIRO, 2018) Sserumaga, J.P.; Beyene, Y.; Pillay, K.; Alois Kullaya; Oikeh, S.O.; Mugo, S.N.; Machida, L.; Ismail Ngolinda; Asea, G.; Justin Ringo; Otim, M.; Abalo, G.; Barnabas KiulaDrought is a devastating environmental stress in agriculture and hence a common target of plant breeding. A review of breeding progress on drought tolerance shows that, to a certain extent, selection for high yield in stress-free conditions indirectly improves yield in water-limiting conditions. The objectives of this study were to (i) assess the genotype × environment (GE) interaction for grain yield (GY) and other agronomic traits for maize (Zea mays L.) across East African agro-ecologies; and (ii) evaluate agronomic performance and stability in Uganda and Tanzania under optimum and random drought conditions. Data were recorded for major agronomic traits. Genotype main effect plus GE (GGE) biplot analysis was used to assess the stability of varieties within various environments and across environments. Combined analysis of variance across optimum moisture and random drought environments indicated that locations, mean-squares for genotypes and GE were significant for most measured traits. The best hybrids, CKDHH1097 and CKDHH1090, gave GY advantages of 23% and 43%, respectively, over the commercial hybrid varieties under both optimum-moisture and random-drought conditions. Across environments, genotypic variance was less than the GE variance for GY. The hybrids derived from doubled-haploid inbred lines produced higher GY and possessed acceptable agronomic traits compared with the commercial hybrids. Hybrid CKDHH1098 ranked second-best under optimum-moisture and drought-stress environments and was the most stable with broad adaptation to both environments. Use of the best doubled-haploids lines in testcross hybrids make-up, well targeted to the production environments, could boost maize production among farmers in East Africa.
Publication - Correction to: genotype by environment interactions and agronomic performance of doubled haploids testcross maize (Zea mays L.) hybrids(Springer, 2018) Sserumaga, J.P.; Oikeh, S.O.; Mugo, S.N.; Asea, G.; Otim, M.; Beyene, Y.; Abalo, G.; Kikafunda, J.
Publication - DT-Bt stacked traits/Events in maize(Drought Tego, 2017) Mugo, S.N.; Murenga, M.G.; Tende, R.; Njeru, E.; Oikeh, S.O.
Publication - Hybrids performance of doubled haploid lines derived from 10 tropical bi-parental maize populations evaluated in contrasting environments in Kenya(Academic Journals, 2017) Beyene, Y.; Mugo, S.N.; Oikeh, S.O.; Juma, C.; Olsen, M.; Prasanna, B.M.The doubled haploid (DH) technology enables maize breeders to develop a large number of homozygous lines rapidly and test them in hybrid combinations early in the breeding cycle. The objectives of this study were to evaluate testcross performance of 556 DH lines derived from 10 diverse tropical backcross (BC1) populations, and to estimate variance components and broad-sense heritability under both well-watered and managed drought-stress conditions in Kenya. The 556 DH testcrosses were divided into six trials, with each trial comprising 84 to 126 entries and six commercial checks developed through conventional pedigree method. Trials were evaluated at 3 or 4 well-watered (WW) and two managed drought-stress (WS) sites in 2012 using an alpha lattice design with three replications per environment. Test crosses of the DH lines showed significant differences in grain yield and other agronomic traits. In the combined analysis across the WW locations, the top 10 DH testcrosses from each trial gave 0.6 to 32.7% higher grain yield than the best commercial check. Under managed drought-stress condition, the top 10 DH testcrosses from each trial gave 11.8 to 40.9% more grain yield than the best check. The best DH lines identified in the study could be used in tropical maize breeding programs in Africa for improving grain yield and drought-tolerance. Following evaluation in advanced testing and national performance trials (NPT), a total of 36 hybrids involving DH lines from this study were recommended for commercial cultivation in east and southern Africa.
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