Current knowledge on Amaranthus spp.: research avenues for improved nutritional value and yield in leafy amaranths in sub-Saharan Africa. Euphytica

Abstract In the past 20 years, very little progress has been achieved in reducing food insecurity, child malnutrition and hunger in Africa. Under-nutrition and micronutrients deficiencies are widespread and affect mainly women and children. To address these problems, increased consumption of African leafy vegetables is promoted as sources of both micronutrients and bio-active compounds. Widely promoted African leafy vegetables include Amaranthus spp., a taxonomic group cultivated worldwide. Species of this genus are used as pseudo-cereals in Europe and America, and are mostly planted as vegetables in Africa. Amaranthus has been rediscovered as a promising food crop mainly due to its resistance to heat, drought, diseases and pests, and the high nutritional value of both seeds and leaves. Leaves are rich in proteins and micronutrients such as iron, calcium, zinc, vitamin C and vitamin A. All parts of the plant are used as medicine to heal many diseases in African communities. This paper focuses on leafy amaranths traditionally utilized on the continent. It briefly reviews the current knowledge on taxonomy, ecology, nutritional and nutraceutical value, production and cultivation systems, reproductive biology, genetic resources and breeding of amaranths. Species of interest include: A. blitum, A. caudatus, A. cruentus, A. dubius, A. hypochondriacus, A. spinosus, A. thunbergii, A. tricolor, and A. viridis. Research and development opportunities on nutritive and nutraceutical properties, production and commercialization, taxonomic evaluation and breeding perspectives were explored

Origin-dependence of variation in seed morphology, mineral composition and germination percentage in Gynandropsis gynandra (L.) Briq. accessions from Africa and Asia

Background: Spider plant [Gynandropsis gynandra (L.) Briq.], an economically promising African leafy vegetable, characterized for leaf yield components and nutritive quality, exhibits poor seed germination that hinders a wider expansion of the crop in urban and periurban horticultural systems. So far, there is little information pertaining to seed morphological traits and mineral elements content that may be associated with higher seed germination. This research investigated the hypothesis that spider plants from different geographical areas exhibited differences in seed mineral composition, morphological traits, and germination capacity. To this end, twenty-nine accessions of Gynandropsis gynandra from West and East-Southern Africa, and Asia were screened for variation in seed size (area, perimeter, length, width), 10-seed weight, mean germination time, germination percentage and mineral content variations. The scanning electron microscopy (SEM), light microscopy and energy dispersive spectroscopy (EDS) solution were used to study seed morphology and mineral composition. Results: We show for the first time the external and internal structure of the seeds of Gynandropsis gynandra and measured eight mineral elements, including carbon (C), oxygen (O), magnesium (Mg), aluminium (Al), phosphorus (P), sulphur (S), potassium (K) and calcium (Ca). The accessions differed significantly (p < 0.001) with respect to seed size (area, perimeter, length, width), 10-seed weight, mean germination time and germination percentage. The hierarchical cluster analysis based on fourteen variables grouped the accessions into three distinct clusters, partially dependent on their geographical origin. Asian accessions exhibited smaller seeds and recorded higher values in terms of germination percentage. West African accessions had bigger seeds but with lower germination percentage. Variation in minerals such as potassium, carbon, and calcium content showed different patterns according to geographical origins. Conclusion: Smaller seeds in G. gynandra exhibited better germination capacity. The Asian germplasm is a potential source of cultivars with a higher germination percentage for improving seed quality in the species.</p

Pratiques culturales et teneur en éléments anti nutritionnels (nitrates et pesticides) du Solanum macrocarpum au sud du Bénin

La pression foncière en région urbaine et périurbaine amène beaucoup deproducteurs maraîchers à avoir des pratiques culturales qui ne garantissentpas la qualité sanitaire des produits récoltés. Cette étude a analysé lespratiques de fertilisation et de traitements phytosanitaires sur les légumesfeuilles traditionnels les plus consommés afin d’identifier ceux à risque. Six(6) échantillons composites de feuilles de S. macrocarpum, répétés deux fois,issus de parcelles ayant reçu des doses de 20, 40 et (20+10+10) t/ha defientes de volaille et de graines de coton, sur un sol ferrallitique faiblementdessaturé au sud du Bénin, ont été analysés au cours des deux premièrescoupes pour la recherche de nitrates par colorimétrie. Dans la zone dedécrue, l’identification et le dosage des pesticides organochlorés parchromatographie en phase gazeuse couplée à un système de détection àcapture d’électrons ont été effectués sur dix (10) échantillons de feuilles et unéchantillon composite de sol (mélange de trois échantillons de sols) prélevésde façon aléatoire dans les champs maraîchers. Le diagnostic approfondi despratiques de fertilisation et de traitements phytosanitaires a montré que defortes doses d’engrais organiques et surtout d’engrais minéraux sontappliquées sur les légumes feuilles dans les zones prospectées. Les taux denitrate dans les feuilles et dans les sols sont faibles (&lt;50mg/kg de matièrefraîche) mais ces taux ont augmenté de la 1ère à la 2ème coupe. Les teneursen pesticides organochlorés totaux sont comprises entre 0,320 et 2,225 μg/gde légumes secs. En dehors de l’endosulfan et du lindane retrouvés dans leséchantillons de légumes, à faibles teneur (respectivement 0,07 et 0,1 μg/g delégumes), les autres pesticides comme le DDT, l’endrine, l’heptachlore,l’aldrine, le dieldrine présentent des teneurs supérieures aux normes Codexappliquées pour le contrôle de la qualité des aliments. Les mêmes pesticidesse retrouvent dans les échantillons de sol.Mots clés: Pratiques culturales, fientes, pesticides organochloré

Designing Gender-Specific Toilet and Urinal Needs Calculation Templates for Rural and Urban Schools: Lessons from the Republic of Benin

Gender equity, quality education, and sanitation in rural and urban areas are widely considered development imperatives. Therefore, many developed countries have scientifically and technically developed norms for the calculation and the design of toilet and urinal needs of their students, which is not yet the case in most developing countries, including the Republic of Benin, that lack socio-culturally adapted gender-specific toilets and urinal needs calculation and design norms. This paper fills this scientific and gender-specific norms gap, by discussing the process and the results of the design of school toilet and urinal needs calculation templates and norms in the Republic of Benin. The study that led to this design took place between June 2013 and October 2015 and consisted mainly of observing and recording defecation and urination needs satisfaction in toilets and open spaces by 8,160 female and 13,263 male students of 13 schools purposively selected in four agroecological and sociocultural areas of Benin. The main data recorded related, among other data, to the start and end times of the use of the toilets and open spaces; the needs satisfied; the peak times and durations of breaks and of toilet needs satisfaction; the numbers of female and male students and non-students who use and who can potentially use the toilets and urinals. These raw data were processed to infer and calculate eight parameters used in each template. This process led to the design of eight area-, gender-, and disability-specific templates and norms in use since 2016, in the target areas. Further studies will assess and report on the performance of these templates and norms

Enabling effective maize seed system in low-income countries of West Africa: Insights from Benin

Introduction Access to high-quality seeds remains a key constraint to the intensification of crop production in low-income countries. In this study, we analyzed maize seed production and distribution systems in Benin to identify leverage points for effective seed systems, a prerequisite for improving maize production. Methods Semi-structured interviews were conducted with 81 seed producers selected in seven municipalities across the three phytogeographical zones of Benin. Key informant interviews were also conducted with ten public and private stakeholders involved in maize seed systems in Benin. Results and discussion Findings showed that the legal and institutional frameworks governing seed systems in Benin were recently reinforced with a national seed policy, the creation and operationalization of the National Committee of Plant Seeds and the existence of regulations and rules on the production, quality control, certification, trade, and packaging of seeds. In addition, enabling conditions to facilitate the involvement of the private sector have been greatly improved with the revision of modalities for obtaining approval for the production and distribution of seeds in Benin. While the seed sector is improving and both public and private stakeholders are involved in maize seed production and distribution, synergies among stakeholders need to be strengthened. Strengthening business and marketing skills of seed producers through training and promoting the comparative advantages of improved seeds in increasing yield and production among maize farmers could be a promising avenue. Connecting seed producers with maize farmers' organizations coupled with ICT-based agro-advisories could boost the development of the maize seed sector, and ultimately the maize value chain

Developing improvement strategies for management of the Sisrè berry plant [Synsepalum dulcificum (Schumach & Thonn.) Daniell] based on end-users’ preferences in Southern Nigeria

Synsepalum dulcificum is a valuable horticultural and lesser-known crop, famous for the uniqueness of its taste modifying properties, which is candidate for genetic improvement in West Africa. Semi-structured interviews were conducted with 100 respondents purposively selected to analyze the current production systems and constraints as well as to document the farmers’ and consumers’ preferences for breeding traits in Southern Nigeria. The results showed that none of the investigated farmers applied all required crop management practices to produce the species (land cleaning before establishment, pegging and lining, holing, base manure application, crop irrigation, weeding, pruning, fertilizers application, and pests and diseases control). Farmers were grouped into three clusters based on crop management practices. There was a strong and highly significant agreement among farmers (Kendall’s W = 0.8, p &lt; 0.001) that bush fire, poor plant growth, drought, pests, and parasitic weed were the five most important constraints in Southwest Nigeria. In Southeast Nigeria, damage by insects and birds, poor seed germinability and poor knowledge of cultivation technics were the most important constraints challenging production. Farmers’ agreement around these constraints was moderate but highly significant (Kendall’s W = 0.6, p &lt; 0.001). Overall, the top three desired breeding traits by farmers included: high growth rate, extended fruit shelf-life, and high fruits yield while the top three consumer’s preferences included: high miraculin potency (long lasting action of the miraculin), fruit glossiness, and high metabolites content. However, cultural specificities were detected in these preferences with a higher agreement in Yoruba farmers’ preferences compared with their counterparts Igbo. The Igbo consumers showed a higher concordance in their traits’ preferences than the Yoruba consumers. These findings pave the way for an informed cultivar development for the Sisrè berry plant in Nigeria and expand knowledge on end-users’ preferences for the species in West Africa

Farmers’ Perception of Viral Diseases and Their Management in Pepper (Capsicum spp.) Production in Benin

Pepper (Capsicum spp.) is an important solanaceous cash crop in Benin; however, productivity is limited due to several key constraints, especially diseases caused by viruses. We sought to understand farmers’ perceptions of viral diseases, management strategies deployed, and to identify the virus population affecting pepper production in Benin. To assess farmers’ perceptions and management of viral diseases, a survey was carried out in four agroecological zones of Benin. A total of 144 pepper farmers were interviewed using the snowball method. A total of 52 pepper leaf samples with virus-like symptoms were collected and diagnosed by reverse-transcriptase polymerase chain reaction (RT-PCR) or PCR. Pepper production systems varied across agroecological zones (P ≤ 0.001) with a predominance of farms practicing monoculture (82%). The majority of farmers (89%) indicated that pests and diseases were the main constraints to increased production. Cucumber mosaic virus (92% of the total samples), Pepper vein yellow virus (52%), and Pepper veinal mottle virus (50%) were the major viruses detected in pepper fields in Benin. There were both single (29%) and mixed (71%) infections of the viruses, suggesting that mixed infections are common for pepper in Benin, confounding efforts to reduce virus infections. Nearly 100% of the farmers surveyed were not aware of these viral diseases. They also could not directly relate symptoms of virus infection to the presence of aphids, whiteflies, or thrips. Farmers relied primarily on synthetic insecticides (93%) to control virus vectors. Interestingly, some farmers applied commercial (12%) and homemade (17%) biopesticides, with neem-based preparations being the most widely used. A total of 15% of farmers used companion cropping with maize, mint or basil and 43% of farmers used crop rotation as a cultural management practice to control viral disease and vector pressure in pepper fields. The implications of this work include the importance of training farmers and extension agents on diagnosis of viruses and their vectors causing viral diseases. This study provides baseline information for the development of host-resistant cultivars and deployment of integrated pest management strategies for pepper in Benin to reduce farmer losses

Fruit and vegetable biodiversity for nutritionally diverse diets: Challenges, opportunities, and knowledge gaps

Planetary health brings together intrinsically linked issues of human health and natural systems. This paper reviews evidence of how agrobiodiversity underpins dietary diversity for current human populations in the context of fruits and vegetables, and ways to maintain and improve these for future generations. Both the conservation and sustainable use of fruit and vegetable biodiversity and the consumption of diverse diets are sub-optimal, and in many contexts getting worse. Agrobiodiversity and nutrition are linked through food availability, access, conservation and consumption, with potential win-wins but notable trade-offs for policy and action through time, place, agrobiodiversity use, and equity. We pinpoint research gaps and call for inclusive deliberation for action