IITA Bibliography System: Recent submissions

Now showing items 1181-1200 of 8125

    • Compositional shifts in microbial diversity under traditional banana cropping systems of sub-saharan Africa 

      Kaushal, M.; Tumuhairwe, J.B.; Kaingo, J.; Richards, M.; Nakamanya, F.; Taulya, G.; Coyne, D. (2022)
      Improvements in the crop productivity, soil health, and sustainable intensification should be premised on the better understanding of interactions between the cropping systems and soil microbial diversity. In this study, we assessed variations in the microbial communities across the traditional banana-based cropping systems of contrasting monocrop vigor (vigorous or V vs. non-vigorous or NV) and the cropping system (monocrop or MC vs. intercropped or IC) using 16S rDNA (V3–V4) and ITS2 amplicon ...

    • Breedbase: a digital ecosystem for modern plant breeding 

      Morales, N.; Ogbonna, A.C.; Ellerbrock, B.J.; Bauchet, G.J.; Tantikanjana, T.; Tecle, I.Y.; Powell, A.; Lyon, D.; Menda, N.; Simoes, C.C.; Saha, S.; Hosmani, P.; Flores, M.; Panitz, N.; Preble, R.S.; Agbona, A.; Rabbi, I.Y.; Kulakow, P.; Peteti, P.; Kawuki, R.; Esuma, W.; Kanaabi, M.; Chelangat, D.M.; Uba, E.; Olojede, A.O.; Onyeka, J.; Shah, T.; Karanja, M.; Egesi, C.; Tufan, H.A.; Agre, A.P.; Asfaw, A.; Jannink, J.; Wolfe, M.; Birkett, C.L.; Waring, D.J.; Hershberger, J.M.; Gore, M.A.; Robbins, K.; Rife, T.; Courtney, C.; Poland, J.; Arnaud, E.; Laporte, M.A.; Kulembeka, H.; Salum, K.; Mrema, E.; Brown, A.; Bayo, S.; Uwimana, B.; Akech, V.; Yencho, C.; de Boeck, B.; Campos, H.; Swennen, R.; Edwards, J.D.; Mueller, L. (2022)
      Modern breeding methods integrate next-generation sequencing (NGS) and phenomics to identify plants with the best characteristics and greatest genetic merit for use as parents in subsequent breeding cycles to ultimately create improved cultivars able to sustain high adoption rates by farmers. This data-driven approach hinges on strong foundations in data management, quality control, and analytics. Of crucial importance is a central database able to 1) track breeding materials, 2) store experimental ...

    • Genome-wide association analysis reveals genetic architecture and candidate genes associated with grain yield and other traits under low soil nitrogen in early-maturing white quality protein maize inbred lines 

      Bhadmus, O.O.; Badu-Apraku, B.; Adeyemo, O.; Agre, A.P.; Queen, O.N.; Ogunkanmi, L.A. (2022)
      Maize production in the savannas of sub-Saharan Africa (SSA) is constrained by the low nitrogen in the soils. The identification of quantitative trait loci (QTL) conferring tolerance to low soil nitrogen (low-N) is crucial for the successful breeding of high-yielding QPM maize genotypes under low-N conditions. The objective of this study was to identify QTLs significantly associated with grain yield and other low-N tolerance-related traits under low-N. The phenotypic data of 140 early-maturing ...

    • Maize nutrient yield response and requirement in the maize belt of Nigeria 

      Aliyu, K.T.; Kamara, A.; Huising, J.E.; Jibrin, J.M.; Shehu, B.M.; Rurinda, J.; Adam, A.M.; Mohammed, I.B.; Vanlauwe, B. (2022)
      Absence of site-specific nutrient recommendation and high spatial variability of soil fertility are major factors affecting maize response to applied nutrients in Nigeria. In this study, we assessed maize response to applied nutrients and nutrient use efficiency in different management zones (MZs), for designing site-specific nutrient management recommendations for maize in the maize belt of Nigeria. The maize belt in Nigeria was earlier delineated into four MZsMZs (MZ1 to MZ4) based on soil ...

    • Aflatoxin and fumonisin mycotoxins contamination along the maize value chain in the eastern Democratic Republic of Congo 

      Matendo, R.E.; Imathiu, S.; Udomkun, P.; Mugumaarhahama, Y.; Akullo, J.; Ishara, J.; Atehnkeng, J.; Owino, W.O. (2022-04)
      Aflatoxin and fumonisin contamination was assessed in different samples along the maize value chain in different territories of South Kivu province. Kabare and Ruzizi Plain were chosen as they represent two different agroecological areas where maize is mostly produced. Twelve districts and one town were selected across the province. The stakeholders were randomly selected, and 215 maize (139 maize grain and 76 maize flour) samples were taken for laboratory analysis. The Q + kit was used to determine ...

    • Grain yield potential and stability of soybean genotypes of different ages across diverse environments in southern Africa 

      Mushoriwa, H.; Mathew, I.; Gwata, E.T.; Tongoona, P.; Derera, J. (2022)
      Soybean [Glycine max (L.) Merrill] is an important crop in southern Africa where it is cultivated in a wide range of agro-ecologies. Both spatial and seasonal variability is high in the region. As a result, breeders aim to release varieties with a fine balance of high productivity potential and stability. Genotype × environment interaction (GEI) limits the selection of superior genotypes in heterogeneous environments consequently slowing down breeding progress. This study determined the magnitude ...

    • Phylogeography and conservation gaps of Musa balbisiana Colla genetic diversity revealed by microsatellite markers 

      Mertens, A.; Bawin, Y.; Abeele, S.V.; Kallow, S.; Swennen, R.; Vu, D.T.; Vu, T.D.; Minh, H.T.; Panis, B.; Vandelook, F.; Janssens, S. (2022)
      Collection and storage of crop wild relative (CWR) germplasm is crucial for preserving species genetic diversity and crop improvement. Nevertheless, much of the genetic variation of CWRs is absent in ex situ collections and detailed passport data are often lacking. Here, we focussed on Musa balbisiana, one of the two main progenitor species of many banana cultivars. We investigated the genetic structure of M. balbisiana across its distribution range using microsatellite markers. Accessions stored ...

    • Contribution of temperate germplasm to the performance of maize hybrids under stress and non-stress environments in South Africa 

      Shandu, S.F.; Gasura, E.; Mashingaidze, K.; Derera, J. (2022)
      Increases in genetic gains are crucial to maize breeding programmes. The objectives of this study were to identify higher-yielding and stable maize hybrids across stress and non-stress environments, to identify representative test environments for testing and selection of superior maize genotypes, and to determine the contribution of temperate maize germplasm in the performance of new tropical hybrids. Respectively 42 and 72 newly developed single-cross hybrids together with check hybrids were ...

    • Genetic diversity and population structure of an African yam bean (Sphenostylis stenocarpa) collection from IITA GenBank 

      Shitta, N.S.; Unachukwu, N.; Edemodu, A.; Abebe, A.T.; Oselebe, H.O.; Abtew, W.G. (2022-03)
      African yam bean, AYB (Sphenostylis stenocarpa), is an underutilized legume of tropical Africa. AYB can boost food and nutritional security in sub-Saharan Africa through its nutrient-rich seeds and tubers. However, inadequate information on germplasm with desirable agro-morphological traits, including insufficient data at the genomic level, has prevented the full exploitation of its food and breeding potentials. Notably, assessing the genetic diversity and population structure in a species is a ...

    • Coupled forest zoning and agricultural intervention yields conflicting outcomes for tropical forest conservation in the Democratic Republic of the Congo (DRC) 

      Nackoney, J.; Demol, M.; Akpona, H.A.; Bauters, M.; Boeckx, P.; Dupain, J.; Facheux, C.; Hansen, M.C.; Kalemba, J.C.; Kehbila, A.G.; Potapov, P.; Senga, A.T.; Six, J.; Turubanova, S.; Williams, D.; Vanlauwe, B. (2022)
      Agricultural intensification and forest conservation are often seen as incompatible. Agricultural interventions can help boost food security for poor rural communities but in certain cases can exacerbate deforestation, known as the rebound effect. We tested whether coupling agricultural interventions with participatory forest zoning could improve food security and promote forest conservation in the Democratic Republic of the Congo. Simple agricultural interventions led to a >60% increase in cassava ...

    • Genome-wide association study reveals genetic architecture and candidate genes for yield and related traits under terminal drought, combined heat and drought in tropical maize germplasm 

      Osuman, A.S.; Badu-Apraku, B.; Karikari, B.; Ifie, B.E.; Tongoona, P.; Danquah, E. (2022)
      Maize (Zea mays L.) production is constrained by drought and heat stresses. The combination of these two stresses is likely to be more detrimental. To breed for maize cultivars tolerant of these stresses, 162 tropical maize inbred lines were evaluated under combined heat and drought (CHD) and terminal drought (TD) conditions. The mixed linear model was employed for the genome-wide association study using 7834 SNP markers and several phenotypic data including, days to 50% anthesis (AD) and silking ...

    • Assessing the spatial variability of soil properties to delineate nutrient management zones in smallholder maize-based system of Nigeria 

      Peter-Jerome, H.; Adewopo, J.; Kamara, A.; Aliyu, K.T.; Dawaki, M.U. (2022)
      Spatially explicit information on soil variability is relevant for agronomic decisions; however, such information is limited in the northern Guinea savanna (NGS) agroecological zone of Nigeria. This study was conducted to delineate soil nutrient management zones (MZs), based on spatial variability of soils in the smallholder maize-based farming system within the NGS. Two hundred and eighty-nine soil samples were analyzed for some physical and chemical properties. Principal component analysis (PCA) ...

    • Interaction of varieties and fungicides across seasons and locations for the control of Asian soybean rust (Phakopsora pachyrhizi) in southwestern Ethiopia 

      Abebe, A.T.; Belachew, K.; Hailemariam, M.; Sileshi, Y.; Ortega-Beltran, A. (2022-08)
      Soybean is emerging as an important legume and oil crop in Ethiopia. However, the crop has been facing serious threats from Asian Soybean Rust (ASR), causing significant damage to the crop and not allowing it to realize its potential. This study aimed to determine the interaction of three varieties with various fungicide treatments across two seasons and two locations to manage ASR. The experiment was laid out in a RCBD in a factorial [three soybean varieties (V) and six fungicides (F)] treatment ...

    • Estimation of soybean grain yield from multispectral high-resolution UAV data with machine learning models in west Africa 

      Alabi, T.R.; Abebe, A.T.; Chigeza, G.; Fowobaje, K.R. (2022-08)
      Soybean (Glycine max (L.) Merr.) is a leguminous and oil crop with rapidly growing importance and demand in Africa following the increasing demand for oil and livestock and poultry feed in sub-Saharan Africa. However, soybean productivity is low in most countries of sub-Saharan Africa, especially in West Africa, where productivity is below one ton per ha. Hence, concerted soybean varietal development and testing efforts have been underway by the International Institute of Tropical Agriculture ...

    • Phenotypic characterization of Amaro coffee (Coffea arabica L.) local accessions using multi-variate techniques at Awada, southern Ethiopia 

      Alemayehu, D.; Garedew, W.; Abebe, A.T. (2022)
      As a country of origin of coffee, Ethiopia is endowed with an immense diversity of the crop in its diverse coffee-growing agro-ecologies. Amaro Kelo is one of the major coffee production agro-ecologies in Ethiopia, where the genetic diversity of its landrace coffee germplasm was not properly characterized previously. The study aimed to characterize 64 Amaro Kelo local coffee accessions to understand the potential of the accessions for utilization in future coffee genetic improvement efforts. The ...

    • Assessing the impact of Youth-in-Agribusiness Program on poverty and vulnerability to poverty in Nigeria 

      Bello, L.O.; Baiyegunhi, L.J.; Danso-Abbeam, G.; Ogunniyi, A.I.; Abdoulaye, T.; Manyong, V.; Bamba, Z.; Awotide, B.A. (2022)
      Poverty persists in many developing countries, including Nigeria, owing to inadequate infrastructure, unemployment, or poor working conditions, among other factors. Youth poverty and vulnerability to poverty have been identified to prevalent among the young population. Using an endogenous switching probit regression approach, in this study, we evaluated the impacts of youth participation in agribusiness programs (YIAPs) on poverty and vulnerability to poverty in Nigeria. Our findings revealed that ...

    • The effect of land inheritance on youth migration and employment decisions in Rwanda 

      Byishimo, P.; Hirpa Tufa, A.; Yami, M.; Alene, A.; Feleke, S.; Abdoulaye, T.; Manyong, V. (2022)
      There is growing mobility of rural youth mainly caused by limited access to land resources and inadequacy of job opportunities. Increased population density coupled with low education rates has increased pressure on natural resources, especially land. This paper assessed the effect of land inheritance on youth migration and employment in Rwanda using the 2010/11 and 2013/14 Integrated Household Living Conditions Surveys (EICVs) data collected from 8160 households by the National Institute of ...

    • Influence of agrosystems on the diversity of mycorrhizae under plantain banana cultivation in the forest region of Kisangani (Tshopo Province, DR Congo) 

      Kasaka, D.; Onautshu, O.D.; Muliwambene, K.; Lebisabo, B.; Katho, G.; Baert, G.; Swennen, R.; Haesaert, G.; Dhed'a, D.B. (2022)
      The largest genetic diversity of plantain banana (Musa AAB subgroup) is found by DRCongo. Arbuscular mycorrhizal fungi (AMF) are synergistic beneficial organisms with a positive effect on growth vigor. We determined the influence of plantain banana-based agrosystems on the diversity of AMF in agroforestry and home-garden field systems located in the Kisangani region of DR Congo. Soil samples of the different agrosystems showed a high mycorrhizal frequency (82.5%) with an overall mycorrhizal rate ...

    • IITA Annual Report 2019 

      International Institute of Tropical Agriculture (IInternational Institute of Tropical Agriculture, 2020)

    • Genomic-assisted breeding for abiotic stress tolerance in horticultural crops 

      Paliwal, R.; Singh, G.; Mir, R.R.; Gueye, B. (Woodhead Publishing, 2021)
      Horticultural crops, including fruits and vegetables, form a major source of nutrition containing minerals and vitamins for humans and have been primarily cultivated since thousands of years of domestication. Their production has crossed the 10 billion tons mark value signifying their massive demand in the market. However, they are adversely affected by various abiotic stresses such as drought, heat, salinity, and cold, which are adversely affecting their production. This highlights serious and ...