Resultados de búsqueda - "West Africa"

Silicon deficiency and the adaptation of tropical rice ecotypes por Winslow, M.D., Okada, Kensuke, Correa Victoria, Fernando J.

“…These results corroborate published findings from West Africa and Hawaii, and lend support to a conclusion that acid-soil upland rice environments in the tropics tend to be deficient in Si, increasing disease damage, among other effects. …”
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Lessons in Theory of Change from a Series of Regional Planning Workshops por Schuetz, Tonya, Förch, Wiebke, Thornton, Philip K., Wollenberg, Eva Karoline, Hansen, James, Jarvis, Andy, Coffey, Kevin, Bonilla Findji, Osana, Aggarwal, Pramod K., Sebastian, Leocadio S., Zougmoré, Robert B., Kinyangi, James, Vermeulen, Sonja J., Radeny, Maren A.O., Moussa, Abdoulaye S., Sajise, A., Khatri-Chhetri, Arun, Richards, Meryl B., Jost, Christine, Jay, A., Loboguerrero Rodriguez, Ana María, Martínez Barón, Deissy

“…The portfolio for 2015 includes about 80 newly contracted projects in five CCAFS target regions (South and Southeast Asia, East and West Africa and Latin America) with a value of between $5-15 million in each region. …”
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Late Pleistocene molecular dating of past population fragmentation and demographic changes in African rain forest tree species supports the forest refuge hypothesis por Duminil, J., Mona, S., Mardulyn, P., Doumenge, C., Walmacq, F., Doucet, J.L., Hardy, Olivier J.

“…We assess the timing of interspecific and intraspecific genetic differentiation and demographic changes within two rain forest Erythrophleum tree species (Fabaceae: Caesalpinioideae).Tropical forests of Upper Guinea (West Africa) and Lower Guinea (Atlantic Central Africa).Six single‐copy nuclear genes were used to characterize the phylogeographical patterns of the parapatric sister species Erythrophleum suaveolens (characteristic of semi‐deciduous or gallery forests) and Erythrophleum ivorense (characteristic of evergreen forests). …”
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Heterotic responses among crosses of IITA and CIMMYT early white maize inbred lines under multiple stress environments por Badu-Apraku, Baffour, Fakorede, M.A.B., Gedil, Melaku A, Talabi, A.O., Annor, B., Oyekunle, M., Akinwale, R., Fasanmade, Y., Akaogu, I.C., Aderounmu, M.

“…Two major constraintsmilitatingagainst the achievement of food security in West Africa (WA) are recurrent drought and poor soil fertility. …”
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Diversity of aflatoxinproducing fungi and their impact on food safety in subSaharan Africa por Probst, C., Bandyopadhyay, Ranajit, Cotty, P.J.

“…Taxa with S strainmorphology differed in distribution with strain SBG limited toWest Africa and both A. minisclerotigenes and thenew lineage from Kenya in Central and East Africa. …”
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Physicochemical and bioactive properties of selected white yam (Dioscorea rotundata) varieties adapted to riverine areas of Nigeria por Alamu, Emmanuel Oladeji, Maziya-Dixon, B.B., Okonkwo, C.C., Asiedu, Robert

“…Yam (Dioscorea spp.) is a major food of cultural, economic and nutritional importance in Nigeria and throughout West Africa. In this sub-region, white yam (Dioscorea rotundata) is the most dominant and important species. …”
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Plant regeneration from axillary bud derived callus in white yam (Dioscorea rotundata) por Manoharan, R., Tripathi, J.N., Tripathi, L.

“…Dioscorea rotundata, commonly known as white yam, is an important staple food crop widely cultivated in West Africa and provides food security to millions of people. …”
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Cassava commercialization in Southeastern Africa por Haggblade, S., Djurfeldt, A., Nyirenda, D., Lodin, J., Brimer, L., Chiona, M., Chitundu, M., Chiwona-Karltun, L., Cuambe, C., Dolislager, M., Donovan, C., Droppelmann, K., Jirstrom, M., Kambewa, E., Kambewa, P., Mahungu, N.M., Mkumbira, J., Mudema, J., Nielson, H., Nyembe, M., Salegua, V., Tomo, A., Weber, M.

“…Despite this potential, cassava commercialization in Southeastern Africa remains in its formative stages, with only 10 per cent to 30 per cent of production currently marketed. Unlike West Africa, where cassava commercialization has centered on marketing prepared cassava-based convenience foods, the emerging cassava markets in Southeastern Africa have centered on fresh cassava, low value-added cassava flour, and experiments in industrial processing of cassava-based starches, biofuels and feeds. …”
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Mapping of QTL associated with resistance to Cassava Brown Streak and Mosaic Diseases in outcrossing cassava cultivars locally cultivated in Tanzania por Masumba, E., Merwe, A. van der, Myburg, Z., Kapinga, F., Kasele, S., Kulembeka, H.P., Mkamilo, G.S., Rounsley, S., Prochnik, S.E., Kanju, E., Ferguson, Morag E.

“…Identification of molecular markers associated with observed plant resistance and tolerance would facilitate marker assisted breeding leading to efficient breeding, knowledge-based deployment of resistance genes and pre-emptive breeding in West Africa. QTL analysis using a bi-parental F1 mapping population was undertaken to identify QTL for CMD resistance in the variety ‘Albert’ and CBSD resistance in the variety ‘Namikonga’. …”
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Assessment of the virulence spectrum and its association with genetic diversity in Magnaporthe oryzae populations from sub-Saharan Africa por Mutiga, Samuel K., Rotich, F., Ganeshan, V.D., Mwongera, D.T., Mgonja, Emmanuel M., Were, Vincent M., Harvey, Jagger J.W., Zhou, B., Wasilwa, L., Feng, C., Ouédraogo, I., Wang, G.L., Mitchell, T.K., Talbot, N.J., Correll, James C.

“…Principal component analysis showed isolates from East Africa were genetically distinct from those from West Africa. Vegetative compatibility tests of a subset of isolates (n = 65) showed no common groups among countries. …”
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Bactrocera invadens (Diptera: Tephritidae), a new invasive fruit fly pest for the afrotropical region: host plant range and distribution in West and Central Africa por Goergen, Georg E., Vayssières, Jean-François, Gnanvossou, D., Tindo, M.

“…In 2003, the invasive fruit ßy Bactrocera invadens Drew, Tsuruta & White (Diptera: Tephritidae) (Drew et al. 2005), of possible Sri Lankan origin, has been detected in the East and about 1 yr later in West Africa. In regular surveys in Benin and Cameroon covering 4 yr, samples from 117 plant species across 43 families have been obtained. …”
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Pathogenicity and host specificity of Brazilian and African isolates of the acaropathogenic fungus Neozygites tanajoae to mite species associated with cassava por Agboton, B.V., Hanna, R., Hountondji, F.C.C., Tiedemann, A. von

“…Neozygites tanajoaeis a host-specific acaropathogen introduced in the late1990s from Brazil into cassava fields in West Africa for biocontrol ofthe cassava green mite (Mononychellus tanajoa). …”
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Comparative assessment of yield potentials of improved cowpea breeding lines using performance index and ranking methods por Ajeigbe, Hakeem A., Mohammed, S., Singh, B.

“…Eighteen cowpea breeding lines including a local check were grown for two years in three environments representing the major cowpea growing zone of West Africa to assess their grain yield potential. The yield data were analyzed and variety means were compared using different methods. …”
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Genetic diversity in cocoa (Theobroma cacao L.) germplasm collection from Ghana por Opoku, S., Bhattacharjee, Ranjana, Kolesnikova-Allen, M., Motamayor, J., Schnell, R., Ingelbrecht, I.L., Enu-Kwesi, L., Adu-Ampomah, Y.

“…Theobroma cacao L. with its center of diversity in Central and South America was first introduced to West Africa in the mid-19th century and today the region produces 70% of the world's cocoa. …”
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Economic analysis of balanced nutrient management technologies for maize production in Kaduna state, Nigeria por Omadachi, U.O., Ahmed, B., Manyong, Victor M., Olukosi, J., Yusuf, O.

“…Leuven) is to curb the vicious cycle of plant nutrient depletion in maize-based farming systems in the moist savanna and humid forest zone of West Africa. This is through integrated nutrient management systems geared to land use practices which are economically viable, ecologically sound and socially acceptable. …”
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Diversification and intensification of agricultural adaptation from global to local scales por Chen, Minjie, Wichmann, Bruno, Luckert, Marty, Winowiecki, Leigh Ann, Förch, Wiebke, Läderach, Peter R.D.

“…We use data on 5314 randomly sampled households located in 38 sites in 15 countries across four regions (East and West Africa, South Asia, and Central America). We estimate empirical models designed to assess determinants of both intensification and diversification of adaptation activities at global scales. …”
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Forage legumes for soil productivity enhancement and quality fodder production por Odunze, A.C., Tarawali, Shirley A., Haan, Nicoline C. de, Akoueguon, E., Amadji, A.F., Schultze-Kraft, Rainer, Bawa, G.S.

“…Also, for farming systems in the subhumid zone of West Africa, nitrogen is generally the most limiting nutrient for crop production, and this problem has been compounded in recent decades by the difficulties faced by farmers in obtaining N fertilizers. …”
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Genetic analysis of drought-adaptive traits at seedling stage in early-maturing maize inbred lines and field performance under stress conditions por Adewale, Samuel A., Akinwale, R.O., Fakorede, M.A.B., Badu-Apraku, Baffour

“…Maize hybrids that are tolerant to drought at the seedling stage are needed to boost productivity in the rainforest agro-ecology of West Africa. Genetics of tolerance of maize seedling to drought stress is not well understood and is poorly documented. …”
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Stratification and synthesis of crop–livestock production systems using GIS por Jagtap, S.S., Amissah-Arthur, A.A.

“…Information related to crop and livestock systems in West Africa is currently available from various sources e.g., household surveys, aerial surveys, rural appraisal, experimental etc., and held by different agencies. …”
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Root characteristics in cowpea related to drought tolerance in seedlings por Matsui, T., Singh, B.B.

“…It is widely grown in semi-arid regions, particularly in West Africa. One objective of the present study was to determine the effects of soil moisture stress on the length, dry matter and distribution of the roots of two cowpea varieties with different drought tolerances. …”
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