IITA Bibliography System: Recent submissions

Now showing items 1061-1080 of 8102

    • Identification of QTLs controlling resistance/tolerance to Striga hermonthica in an extra-early maturing yellow maize population 

      Badu-Apraku, B.; Adewale, S.A.; Agre, A.P.; Gedil, M.; Asiedu, R. (2020-08-10)
      Striga hermonthica parasitism is a major constraint to maize production in sub-Saharan Africa with yield losses reaching 100% under severe infestation. The application of marker-assisted selection is highly promising for accelerating breeding for Striga resistance/tolerance in maize but requires the identification of quantitative trait loci (QTLs) linked to Striga resistance/tolerance traits. In the present study, 194 F2:3 families of TZEEI 79 × TZdEEI 11 were screened at two Striga-endemic locations ...

    • Assessing inbred-hybrid relationships for developing drought tolerant provitamin A - quality protein maize hybrids 

      Obeng-Bio, E.; Badu-Apraku, B.; Ifie, B.E.; Danquah, A.; Blay, E.; Dadzie, A.M. (2020-09-10)
      Drought tolerant early maturing maize (Zea mays L.) inbred lines with high levels of provitamin A and quality protein (PVA‐QPM) are urgently needed for development of superior hybrids to mitigate malnutrition and intensify maize production and productivity in sub‐Saharan Africa (SSA). This study was designed to (1) identify early maturing inbred lines with combined tolerance to drought, elevated tryptophan and PVA contents, (2) examine inbred‐hybrid relationships for tryptophan and PVA accumulation, ...

    • Genetic diversity among early provitamin A quality protein maize inbred lines and the performance of derived hybrids under contrasting nitrogen environments 

      Obeng-Bio, E.; Badu-Apraku, B.; Ifie, B.E.; Danquah, A.; Blay, E.T.; Dadzie, M.A.; Noudifoulè, G.T.; Talabi, A.O. (2020-07-18)
      Information on population structure and genetic diversity of germplasm in a breeding programme is useful because it enhances judicious utilisation of genetic resources to achieve breeding objectives. Seventy early maturing provitamin A (PVA) quality protein maize (QPM) inbreds developed by the IITA- maize improvement programme were genotyped using 8171 DArTseq markers. Furthermore, 96 hybrids derived from 24 selected inbreds plus four checks were evaluated under low-N and optimal environments in ...

    • Transitioning European protein-rich food consumption and production towards more sustainable patterns-strategies and policy suggestions 

      Manners, R.; Blanco-Gutiérrez, I.; Varela-Ortega, C.; Tarquis, A.M. (2020-03-04)
      Global and European diets have shifted towards greater consumption of animal proteins. Recent studies urge reversals of these trends and call for a rapid transition towards adoption of more plant-based diets. This paper explored mechanisms to increase the production and consumption of plant-proteins in Europe by 2030, using participatory backcasting. We identified pathways to the future (strategies), as well as interim milestones, barriers, opportunities and actions, with key European stakeholders ...

    • The nexus between cocoa production and deforestation 

      Asare, R. (2019)
      In Ghana, cocoa contributes substantially to the agricultural foreign earnings and plays a major role in providing income for millions of farmers and households. But its production has environmental impacts, like deforestation. Creating a policy environment that supports sustainable practices in agriculture to leverage the cocoa forests for biodiversity conservation is essential.

    • The root-knot nematode, Meloidogyne incognita, profoundly affects the production of popular biofortified cassava cultivars 

      Akinsanya, A.K.; Afolami, S.O.; Kulakow, P.; Coyne, D. (2020-07-14)
      Despite being the single largest cassava-producing country, yields in Nigeria remain consistently poor and among the lowest. Regionally, yields are also particularly low across Africa. Pests and pathogens, including plant-parasitic nematodes, play an important role in this current yield deficit. African countries are not only faced with the problem of food security but also that of nutritional deficiency, due to limited micronutrients in the diet. In this study, six biofortified cultivars were ...

    • Reducing child undernutrition through dietary diversification, reduced aflatoxin exposure, and improved hygiene practices: the immediate impacts in central Tanzania 

      Anitha, S.; Muzanila, Y.; Tsusaka, T.W.; Kachulu, L.; Kumwenda, N.; Musoke, M.; Swai, E.; Shija, J.; Siambi, M.; Monyo, E.S.; Bekunda, M.A.; Okori, P. (2019-11-28)
      The study aimed to quantify the immediate effects of dietary diversification, food safety, and hygiene interventions on child undernutrition in four rural villages in Kongwa district of central Tanzania. One hundred mothers with their children of less than 24 months old were recruited for this study. The difference-in-difference (DID) method was used to assess the effects of intensive intervention through a learning-by-doing process on the topic of aflatoxin free diversified food utilization and ...

    • Genome engineering: a new frontier for improving root and tuber crops 

      Okwuonu, I.C.; Obidiegwu, J.; Onyeka, T.J.; Egesi, C. (CRC Press, 2022)

    • Seed dressing maize with imazapyr to control Striga hermonthica in farmers’ fields in the 

      Kamara, A.Y.; Menkir, A.; Chikoye, D.; Solomon, R.; Tofa, A.I.; Omoigui, L.O. (2020-03-17)
      Use of small doses of imazapyr and pyrithiobac for seed coatings of imazapyr-resistant maize hybrids (IR-Maize) offers an effective means to control Striga hermonthica. Field trials were conducted in Bauchi and Kano States of Nigeria in 2014 and 2015 under heavy Striga infestation to evaluate the potential effectiveness of herbicide coated hybrids maize on Striga control in farmers’ field. Results showed that herbicide coated seeds reduced number of emerged Striga per m2 and Striga damage symptoms ...

    • Production of banana bunchy top virus (BBTV)-free plantain plants by in vitro culture 

      Tchatchambe, N.B.J.; Ibanda, N.; Adheka, J.G.; Onautshu, O.D.; Swennen, R.; Dhed'a, D.B. (2020-03)
      Banana Bunchy Top Disease (BBTD) caused by the Banana Bunchy Top Virus (BBTV) is one of the most important banana diseases in the Democratic Republic of Congo. This study focused on the production of BBTV-free plantain seedlings from infected banana plants. A total of 10 suckers from the French plantain Litete (Musa AAB) and the False Horn plantain Libanga Likale (Musa AAB) with advanced BBTD symptoms were collected. Meristematic apices excised from those suckers were cultured in vitro and subcultured ...

    • Pathogenicity of the root-lesion nematode, pratylenchus zeae, on rice genotypes under different hydro-ecologies in Tanzania 

      Nzogela, Y.B.; Landschoot, S.; Kihupi, A.L.; Coyne, D.L.; Gheysen, G. (2020)
      The root-lesion nematode, Pratylenchus zeae, is commonly found in upland rice fields. To measure the impact of the nematode on rice production, a screenhouse experiment was conducted using two farmer-adapted Oryza sativa cultivars, ‘Supa’ (‘SurinamV-880’) and ‘SARO-5’ (‘TXD 306’), under flooded, upland and drought water regimes imposed at 7 days post-inoculation of mixed-stage nematodes (200, 500, 1000, 3000 and 10 000 plant−1). Growth and yield parameters were recorded, and the experiment was ...

    • Gender accommodative versus transformative approaches: a comparative assessment within a post-harvest fish loss reduction intervention 

      Cole, S.M.; Kaminski, A.M.; McDougall, C.; Kefi, A.S.; Marinda, P.A.; Maliko, M.; Mtonga, J. (2020-03-25)
      Technical and social constraints limit value chain actors from equitably engaging in and benefiting from capture fisheries in low-income settings. Extension and development programs often focus on the former, which reflects a technocratic orientation of the fisheries sector and uncertainty about effective ways for development programs to engage with gender and other social constraints. This study presents empirical insights that address these challenges to fisheries development. The study took ...

    • Free-living nematode assemblages in the rhizosphere of watermelon plants in Nigeria: a baseline study 

      Bello, T.T.; Coyne, D.L.; Fourie, H. (2020)
      Watermelon is increasingly produced and consumed in Nigeria and sub-Saharan Africa. However, limited information exists regarding nematode pests and beneficial/free-living nematodes associated with the crop. The present study recorded the abundance and diversity of free-living nematodes from 50 watermelon fields across south-west Nigeria during 2016/2017. Of the 30 genera identified from soil samples, Cephalobus, followed by Rhabditis, Aphelenchus and Aporcelaimus, were predominant. Variation in ...

    • Extruded flakes from pearl millet (Pennisetum glaucum)-carrot (Daucus carota) blended flours-production, nutritional and sensory attributes 

      Adebanjo, L.A.; Olatunde, G.O.; Adegunwa, M.O.; Dada, O.C.; Alamu, E.O. (2020)
      Millet flour (M) and carrot flour(C) were produced and blended in the ratios 100M:0C, 95M:5C, 90M:10C, 85M:15C and 80M:20C respectively to produce extruded flakes. The composite flours were subjected to analysis of the proximate and mineral composition, as well as functional and pasting properties. Extruded flakes were analyzed for proximate composition, total carotenoids, colour and sensory evaluation. There was no significant difference (p > 0.05) in the proximate, functional and pasting properties ...

    • GIS based classification of maize testing locations in West and Central Africa 

      Menkir, A.; Kling, J.G.; Jagtap, S.S.; Aliu, B.A. (2000)
      Stratifying a broad target growing area of a crop into different ecological zones has been an important first step in plant breeding. To cater for the diverse maize growing environments in West and Central Africa, germplasm development and testing at IITA have been targeted to four agroecological zones broadly defined based on experiences and knowledge of researchers. This study was carried out to group maize testing locations with similar climatic features, and then use the groups to produce a ...

    • Understanding the response of sorghum cultivars to nitrogen applications in the semi-arid Nigeria using the agricultural production systems simulator 

      Akinseye, F.M.; Ajegbe, H.A.; Kamara, A.Y.; Adefisan, E.A.; Whitbread, A.M. (2020-01-16)
      The Agricultural Production Systems simulator (APSIM) model was calibrated and evaluated using two improved sorghum varieties conducted in an experiment designed in a randomized complete block, 2014–2016 at two research stations in Nigeria. The results show that the model replicated the observed yield accounting for yield differences and variations in phenological development between the two sorghum cultivars. For early-maturing cultivar (ICSV-400), the model indicated by low accuracy with root ...

    • Temperature-dependent development, survival and reproduction of Apanteles hemara (Nixon) (Hymenoptera: Braconidae) on Spoladea recurvalis (F.) (Lepidoptera: Crambidae) 

      Agbodzavu, M.K.; Osiemo-Lagat, Z.; Gikungu, M.; Ekesi, S.; Fiaboe, K.K.M. (2020-02-18)
      The temperature-dependent development of Apanteles hemara (Nixon), a larval endoparasitoid of the devastating amaranth pest Spoladea recurvalis (F.) was studied in the laboratory at six constant temperatures (10, 15, 20, 25, 30 and 35 °C), a photoperiod of 12L:12D and a relative humidity of 60–70%. Developmental time decreased significantly with increasing temperature within the range of 15–30 °C. The parasitoid's pupal mortality, successful parasitism rate, adult emergence rate and longevity, sex ...

    • Plant tissue analysis as a tool for predicting fertiliser needs for low cyanogenic glucoside levels in cassava roots: an assessment of its possible use 

      Imakumbili, M.L.; Semu, E.; Semoka, J.M.; Abass, A.; Mkamilo, G. (2020-02-13)
      The use of plant tissue analysis as a tool for attaining low cyanogenic glucoside levels in cassava roots, has hardly been investigated. Just as the quality of crops is improved through the use of plant tissue analysis, the same can probably be done to consistently attain the lowest possible cyanogenic glucoside levels in cassava roots. High levels of cyanogenic glucosides in consumed fresh cassava roots or in their products have the potential of causing cyanide intoxication, hence the need to ...

    • Phenotypic characterization and validation of provitamin A functional genes in early maturing provitamin A-quality protein maize (Zea mays) inbred lines 

      Obeng‐Bio, E.; Badu‐Apraku, B.; Ifie, B.E.; Danquah, A.; Blay, E.T.; Dadzie, M.A. (2019)
      The number of drought and low‐N tolerant hybrids with elevated levels of provitamin A (PVA) in sub‐Saharan Africa could increase when PVA genes are optimized and validated for developed drought and low‐N tolerant inbred lines. This study aimed to (a) determine the levels of drought and low‐N tolerance, and PVA concentrations in early maturing PVA‐quality protein maize (QPM) inbred lines, and (b) identify lines harbouring the crtRB1 and LcyE genes as sources of favourable alleles of PVA. Seventy ...

    • Improving the efficiency of Beauveria bassiana applications for sustainable management of Plutella xylostella (Lepidoptera: Plutellidae) in West Africa 

      Agboyi, L.K.; Ketoh, G.K.; Kpindou, O.K.D.; Martin, T.; Glitho, I.A.; Tamὸ, M. (2020-05)
      The effectiveness of the entomopathogenic fungus Beauveria bassiana (Balsamo) Vuillemin isolates Bb11, Bb115, Bb116 and Bb362 against the diamondback moth (DBM), Plutella xylostella (L.) population from Cotonou, Benin, was investigated in the laboratory and on station. In the laboratory, six concentrations, 104, 105, 106, 107, 108 and 109 conidia/ml of each isolate were used to assess B. bassiana virulence. Third instar DBM larvae were inoculated with 2 µl of each isolate’s concentrations by topical ...