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Makumbi, D.

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Makumbi
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Makumbi, D.

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Now showing 1 - 10 of 10
  • Chapter 4. Host Plant Resistance in Maize to Fall Armyworm
    (CIMMYT, 2021) Prasanna, B.M.; Bruce, A.Y.; Beyene, Y.; Makumbi, D.; Gowda, M.; Asim, M.; Martinelli, S.; Parimi, S.
    Publication
  • Accelerated development and deployment of elite maize hybrids tolerant to maize lethal necrosis, a major disease of maize in eastern Africa
    (2018) Beyene, Y.; Gowda, M.; Olsen, M.; Jumbo, M.B; Makumbi, D.; Regasa, M.W.; Mugo, S.N.; Prasanna, B.M.
    Publication
  • Advances in Breeding for Resistance/Tolerance to MLN
    (2018) Suresh, L.M.; Beyene, Y.; Makumbi, D.; Jumbo, M.B; Gowda, M.; Regasa, M.W.; Olsen, M.; Mugo, S.N.; Prasanna, B.M.
    Publication
  • Developing maize varieties that adapt to climate change :the role of CIMMYT and partners in Africa
    (CIMMYT, 2016) Regasa, M.W.; Mugo, S.N.; Beyene, Y.; Makumbi, D.; Owino, F.; Abate, T.; Olsen, M.; Machida, L.; Suresh, L.M.; Prasanna, B.M.; Jumbo, M.B
    Publication
  • On-farm yield gains with Stress-Tolerant Maize in Eastern and Southern Africa
    (American Society of Agronomy, 2017) Setimela, P.; Magorokosho, C.; Lunduka, Rodney; Gasura, E.; Makumbi, D.; Tarekegne, A.T.; Cairns, J.E.; Ndhlela, T.; Erenstein, O.; Mwangi, W.M.
    Maize (Zea mays L.) is the most important staple food in eastern and southern Africa (ESA) with human maize consumption averaging 91 kg capita–1 yr–1. Current maize yield averages 1.2 t ha–1 and is barely suffi cient for the region’s requirements due to drought and low N stresses. Th e objective of this study was to compare new drought tolerant (DT) maize hybrids and open pollinated varieties (OPVs) against the best commercial varieties in ESA under farmer management conditions and to validate on-station results. Maize varieties were simultaneously selected on-station in four types of environments across 44 locations in ESA during the 2008/2009 and 2009/2010 seasons. During the 2010/2011 and 2011/2012 seasons, 20 promising DT maize hybrids and OPVs were selected from the on-station based on their mean grain yield and stability. Th ese selected varieties were compared with the best commercial check varieties on-farm across 80 locations in ESA in a randomized complete block design for two seasons. The genotype + genotype × environment comparison biplot showed variety CZH0616 together with other new DT hybrids to be stable and high yielding across 44 locations on-station in the ESA region compared to the commonly grown checks such as SC513. Th e new DT hybrids showed a yield advantage over the commercial check varieties both in the early and medium-late maturing categories by 4 to 19%, and the gains were bigger under stress conditions. Under farmers’ fi elds CZH0616, CZH0837, CZH0935, and CZH0928 were high yielding and stable across locations.
    Publication
  • Gains in maize genetic improvement in Eastern and Southern Africa: I. CIMMYT hybrid breeding pipeline
    (Crop Science Society of America (CSSA), 2017) Masuka, B.; Atlin, G.; Olsen, M.; Magorokosho, C.; Labuschagne, M.; Crossa, J.; Banziger, M.; Pixley, K.V.; Vivek, B.; Biljon, A.; MacRobert, J.; Alvarado Beltrán, G.; Prasanna, B.M.; Makumbi, D.; Tarekegne, A.T.; Das, B.; Zaman-Allah, M.; Cairns, J.E.
    Monitoring of genetic gain in crop genetic improvement programs is necessary to measure the efficiency of the program. Periodic measurement of genetic gain also allows the efficiency of new technologies incorporated into a program to be quantified. Genetic gain within the International Maize and Wheat Improvement Centre (CIMMYT) breeding program for eastern and southern Africa were estimated using time series of maize (Zea mays L.) hybrids. A total of 67 of the best-performing hybrids from regional trials from 2000 to 2010 were selected to form an era panel and evaluated in 32 trials in eight locations across six countries in eastern and southern Africa. Treatments included optimal management, managed and random drought stress, low-nitrogen (N) stress and maize streak virus (MSV) infestation. Genetic gain was estimated as the slope of the regression of grain yield on the year of hybrid release. Genetic gain under optimal conditions, managed drought, random drought, low N, and MSV were estimated to have increased by 109.4, 32.5, 22.7, 20.9 and 141.3 kg ha−1 yr−1, respectively. These results are comparable with genetic gain in maize yields in other regions of the world. New technologies to further increase the rate of genetic gain in maize breeding for eastern and southern Africa are also discussed.
    Publication
  • Maize variety options for Africa: Uganda
    (CIMMYT, 2015) Abate, T.; Makumbi, D.; Regasa, M.W.; Asea, G.; Wawa, B.
    Maize is the most important cereal in Uganda. Annual rates of growth for area, yield and production were 4.5%, 4.0% and 8.9%, respectively, between 2000 and 2013. Improved maize variety releases in Uganda between 2007 and 2014 grew by 46% in comparison to the 2000 to 2006 period. Hybrid turnover in Uganda is 11 years (one of the shortest in SSA) and OPVs have 16 years. The use of hybrids is increasing at a fast rate. Variety releases have been tailored to fit the capacity of national seed companies – companies with adequate capacity were licensed more sophisticated hybrids whereas smaller companies were given less complex top crosses.
    Publication
  • Maize variety options for Africa: Tanzania
    (CIMMYT, 2015) Abate, T.; Gethi, J.; Regasa, M.W.; Makumbi, D.; Kitenge, K.; Wawa, B.
    With more than 4 million ha harvested, Tanzania is the second largest country, after Nigeria, in area occupied by maize in SSA. Maize production outstrips all cereals and other staples in Tanzania. In general, production showed upward trends starting in t
    Publication
  • Maize variety options for Africa: Kenya
    (CIMMYT, 2015) Abate, T.; Regasa, M.W.; Makumbi, D.; Wawa, B.; Ajanga, S.
    Maize is by far the largest contributor of food security in Kenya. Maize productivity growth has been slow owing to recurrent drought; the advent of MLN (Maize Lethal Necrosis) has increased the challenges of maize production in Kenya.
    Publication
  • Agronomic performance and genotype X environment interaction of herbicide-resistant maize varieties in eastern Africa
    (Crop Science Society of America (CSSA), 2015) Makumbi, D.; Diallo, A.O.; Kanampiu, F.; Mugo, S.N.; Karaya, H.
    Striga hermonthica (Del.) Benth. and Striga asiatica (L.) Kuntze severely affect maize (Zea mays L.) production in sub-Saharan Africa. A single Striga plant produces a large number of seeds that form a bank of viable but dormant seed in the soil until they get a chemical signal from suitable maize host roots. Imidazolinone-resistant (IR) open-pollinated maize varieties (OP Vs) developed for Striga control were tested in diverse environments in four countries of eastern Africa in 2004. The objective of the study was to assess the agronomic performance of IR maize and genotype  environment interactions (GE) for grain yield (GY) and the number of emerged Striga plants across 17 environments under Strigainfested and Striga-free conditions. In the combined analysis of variance across Striga-infested and Striga-free locations, mean squares for genotypes and GE were significant for most measured traits. The best IR maize variety (STR-VE-216) outyielded the Striga-tolerant and commercial genotypes by 113 and 89%, respectively, under Striga-infested conditions. IR OP Vs supported significantly fewer emerged Striga plants relative to the check varieties. Under Striga-free conditions, IR OP Vs showed GY advantage over commercial varieties. Under Striga-infested conditions genotypic variance ( 2 G ) was larger than genotype  location variance ( ´ 2 G L ) for GY and number of emerged Striga plants at 12 wk after planting. The genetic correlations among locations under Striga-infested conditions were high (0.990), suggesting little GE between most environments used. Cluster analysis of genotypes under Striga-infested locations revealed two major groups that separated the IR OP Vs from the check varieties. The outstanding performance of selected IR OP Vs indicates that their use for Striga control would reduce the Striga seed bank while benefiting farmers with high GY
    Publication