Research information from Organisations and projects in Nigeria

Projects with partners - Nigeria (19)

  • Assessing factors controlling the growth and potential yield of yam (Dioscorea spp.)

    This study aims at achieving a better understanding of factors affecting the growth and productivity of yam. Field experiments and model tools will be used to evaluate the effects of soil properties and yam species on the growth parameters and to estimate the potential yield of the crop.

  • Can changes in the community structure of arbuscular mycorrhizal fungi contribute to explain the rapid yield decrease of crops following forest clearance in Southern Cameroon?

    Rapid yield declines after deforestation in small holders’ cropping systems in the humid forest zone in Africa might be partly explained by a change in arbuscular mycorrhizal fungi community structure. Linking identification and function of these microorganisms will allow testing this hypothesis.

  • Development and testing of cassava lines with improved resistance to African Cassava Mosaic Virus

    Development of virus resistant and nutritional improved cassava via transgene technology can challenge the food insecurity and alleviate the poverty in Africa, where cassava is one of the major crops for more than 200 million people. Over the last several years we have produced genetically modified cassava plants conferring resistance to African cassava mosaic virus (ACMV) and improved quality based on state−of−the−art strategies. Furthermore, we devote ourselves to building the capacity of testing and delivering enhanced genetically modified germplasm to local farms through multiple collaborations among the involved partners in the project.

  • Enhancing Agricultural Development for Poverty reduction in Africa - A joint NEPAD/IFPRI Program

    Major Research Domain: agricultural development, food security, NEPAD, policy communication Goal: To strengthen and support NEPAD's efforts in promoting agricultural development in Africa

  • Farmers participatory improvement of production technologies for rainfed rice-based systems in West Africa with emphasis on Nigeria and Benin (NEW CONTRACT-NO: 81051376)

    Major Research Domain: Rice-based farming systems, technology generation, dissemination approaches Goal: Development of approaches that ensure generation and dissemination of demand driven technologies in rainfed rice-based cropping systems in West Africa Outputs: - To extrapolate available approaches to other sites and crops - To measure the impact of adapted technologies - To generate more complex technologies that effect farm household and village - To make available a system of demand driven technology generation and dissemination

  • Food security and poverty alleviation through improved valuation and governance of river fisheries in Africa

    Major Research Domain: inland fisheries, policy advice, fishery policies, economic valuation Goal: To sustain and improve the livelihoods of the rural poor who depend on inland fisheries for their income, employment and food security along the rivers and fringing floodplains of the Lake Chad and Zambesi Basins

  • Gene transfer techniques for cassava (Manihot esculenta Crantz)

    Cassava is one of the most important calorie sources in the Least Developed Countries, providing food for over 500 million people. Cassava yields are reduced by pests and diseases. Classical breeding of cassava is difficult due to the vegetative propagation mode, outcrossing nature, high heterozygosity and low fertility of the plants as well as due to the lack of resistance genes in the sexually compatible germplasm. We are developing transformation methods for cassava, to overcome the constraints of traditional breeding in close collaboration with CIAT and IITA. We have developed a method allowing regeneration of transgenic cassava plants, using Agrobacterium-mediated gene transfer, with molecular data to prove stable integrative transformation. Our final goal is a protocol that is reliable, efficient as well as easy to handle and to transfer to other laboratories. Parallel to the optimisation work we have also already started applying the transformation technique to transferring agriculturally relevant genes to cassava.

  • Genetic engineering of insect resistance in cassava

    Cassava hornworm (Erinnyis ello) is one of the most important cassava pests in the Americas. The larvae can completely defoliate the plants and also kill young plants. Defoliation and stem damage reduce the starch quality of the roots and cause yield losses between 10% and 50%. Other cassava pests, such as mealybug (Phenacocus manihoti), green mite (Monoychellus tanajoa) and whitfly (Bemisia tabaci), also cause considerable damage to cassava crops (up to 80%). We want to study the possibility of developing a biological control system for cassava insect pest by expressing a synthetic CryIA(b) gene encoding Bacillus thuringiensis (Bt) endotoxin in transgenic cassava plants. Spraying B. thuringiensis has been shown to be efficient in biological control of all larval stages of cassava hornworm. Expression of the CryIA(b) gene in transgenic cassava would thus complement the available methods for pest control in an environmentally and economically sustainable way.

  • Genetically engineered resistance to African Cassava Mosaic Virus (ACMV) in cassava

    African cassava mosaic disease (ACMD) is the most serious disease threatening cassava production in Africa at present. The losses caused by ACMD throughout the continent are 40%, and locally the harvests can be lost completely. ACMD is caused by the geminivirus African cassava mosaic virus (ACMV) and transmitted by whiteflies (Bemisia tabaci). ACMV has circular single-stranded DNA (ssDNA) denoted DNA A and B, which is encapsidated in twin icosahedral particles. No cassava variety completely resistant to ACMV could so far be produced by traditional breeding. e want to engineer resistance against the African Cassava Mosaic Virus (ACMV) using two different approaches and to study the effectiveness of these methods in conferring cassava resistant against ACMV. The first approach involves expression of antisense RNAs as 3' untranslated regions of a selectable marker gene. The second approach relies on mimicking the hypersensitive reaction (HR) of incompatible host-pathogen interactions by taking advantage of the regulation of the ACMV promoters. The ultimate goal is to produce transgenic cassava plants resistant to ACMV in the field.

  • Indigenous arbuscular mycorrhizal fungi (AMF) from the West African “yam belt”: examination of their potential to improve yam growth and reduce yam nematodes infestation

    The general objective of this project is to begin the assessment of AMF biodiversity in the “yam belt” region of West Africa and assess the interaction of suitable isolates with yam and yam nematodes, which offer promise towards improved yam (Discorea spp.) production. Specifically the project aims to: 1. Investigate the prevalence and diversity of AMF in the ‘yam belt’ area of Togo and Benin (West Africa); 2. Screen AMF isolates for their host specificity to yam; 3. Test selected AMF isolates for their potential to improve yam growth; 4. Assess selected AMF isolates for their potential to suppress nematodes (and associated rot causing fungi) on yam. This study will lay the basic knowledge on the interactions between AMF, yam and nematodes for a prospective application of AMF in West African yam production, particularly as a highly novel approach to improving yam seed material for protection against pathogens, which may have particular reference (applicability) to tissue culture plantlets.

  • Mobilizing regional diversity for creating new potentials for pearl millet and sorghum farmers in West and Central Africa

    To enhance rural livelihoods and household food security in pearl millet-and sorghumgrowing areas of WCA through cultivation of adapted, higher-yielding and stable cultivars of these staple cerealsTo assist NARS in the target countries to more effectively utilize genetic diversity of locally adapted, farmer-preferred photoperiod-sensitive, pearl millet and sorghum germplasm in their breeding programs

  • Participatory breeding of superior, mosaic disease-resistant cassava: enhancing uptake

    Objectives: Benefits for poor people generated by application of new knowledge on crop protection to annual and herbaceous crops in Forest Agriculture production systems. Background: In a collaborative project with PSRP, about 2,000 cassava seedlings from superior, CMD-resistant parents have been grown amongst three communities of Ghanaian cassava farmers. A process was validated whereby farmers and a multidisciplinary team of scientists collaborated together throughout the initial seedling generation and just four subsequent clonal generations to select out 39 superior diseases-resistant clones acceptable to all three groups of participants. The criteria for each were recorded throughout this process. Although yield was important to the farmers, qualitative criteria were also important. Disease resistance was selected for during this process. This is the first time the latter has been reported during participatory breeding and contradicts the concept that diseases are less 'apparent' to farmers than, for example, insect feeding damage.

  • Participatory development of cassava green mite biocontrol in the highlands of Cameroon

    Cassava is a main staple in many parts of Africa. And, in the processed form of “gari”, it con-stitutes an essential income source of the rural women in certain areas. This holds certainly true for the target area of this project, the North-West Province (NWP) in Cameroon. There, the two most important biotic constraints to cassava cropping are the cassava green mite Mononychellus tanajoa and Cassava Mosaic Disease (CMD). The objective of the project is to develop respective biocontrol strategies acceptable to farmers. Our main approach to control cassava green mite is based on an exotic predatory mite, the phytoseiid Typhlodromalus aripo. This predator, released in the NWP in 1997, is by far not as abundant as it is in other parts of Cameroon. One reason is suspected in the varieties grown by the farmers, which lack features essential to T. aripo. The relatively cool mid-altitude cli-mate is likely to be another cause.

  • Prolongation of leaf life by autoregulatory senescence inhibition in cassava

    Cassava leaves contain valuable high quality protein. In certain regions they constitute a major component in the daily protein intake. Leaf harvesting reduces root yields. Thus leaves can only be harvested every two months. Prolonging the life of individual leaves could maintain a satisfactory photosynthetic area while allowing more frequent harvesting of leaves. We want to produce transgenic cassava plants expressing the ipt gene from A. tumefaciens under the control of a senescence-specific promoter from Arabidopsis thaliana leaves. By use of senescence specific promoter, an autoregulated production of cytokinin leading to prolonged leaf life should be obtained.

  • Realising sustainable weed management to reduce poverty and drudgery amongst small scale farmers in the West African savannah

    Objectives: Improved weed management strategies evaluated and promoted through novel participatory methods and much closer liaison between researchers, disseminators, and policy makers. Background: Continuous cultivation of the moist savannah zone with inadequate use of nutrient inputs in Nigeria has recently become a common practice as a result of a combination of rapidly expanding population and increasing urban market demand. This appears to be a microcosm of what the future seems to hold for the entire moist savannah zone in West Africa. Regrettably, this has occurred without the use of balanced nutrient management systems and thus the natural resource base of the soil is being contnuously degraded. In consequence, crop yields are falling to very low levels and poverty amongst agricultural communities is widespread, with average income falling to less than $1 per day.

  • soil recovery through use of microbes and plant

    Soil fertility is important, degraded soil can be ammended through the use of microbes and plants that are nitrogen fixing

  • SFB 308 Standortgerechte Landwirtschaft in West Afrika

    With the completion of the Special Research Program 308 on Adapted Farming in West Africa the time has come to sum up the experiences of 15 years of agricultural research. This research program, carried out by scientists from the University of Hohenheim, played a particular role in the context of agricultural research systems in West Africa. With a funding provided upon review of results and application over five phases of three years each, short-term research plans had to be drawn up with a long term perspective. Inter-institutional collaboration with international as well as national partners required fine tuning and an accommodation of plans to fit and complement existing efforts and priorities of the existing research institutions. Interdisciplinary approaches generated synergy effects.

  • Understanding yam (Dioscorea sp.) response to fertilizer application

    This project aim at understanding D. alata and D. cayenensis-rotundata response to mineral fertilizer application by studying their biomass production and nutrient uptake and allocation, the development of their root systems and the source-sink relationships.

  • Up-scaling sustainable clean seed yam production systems for small-scale growers in Nigeria

    Objectives: Benefits for poor people generated by application of new knowledge on crop protection to annual and herbaceous crops in Forest Agriculture production systems. Background: Scarcity and expense of clean planting material (seed yams) is a major constraint to increasing yam production and productivity in West Africa. Traditional methods of seed yam production under low-input systems were found inadequate for supply of the large quantities required by farmers. The minisett technique was developed by NRCRI and IITA in the 1970s as a rapid means of multiplying yam germplasm, but it was shown that while 78.8% of the farmers in the eastern forest zone of Nigeria were aware of the technique, only 48.8% actually practised it. More recent experience from CPP-funded projects (R8278, R7503) indicates that uptake is even lower than this.