The Future of Food: Domestication and Commercialization of Indigenous Food Crops in Africa over the Third Decade (2012–2021)
Abstract
:1. Introduction
- Greater understanding of ethnobotany, traditional knowledge of indigenous species and their deliberate cultivation by farmers;
- The application of vegetative propagation techniques in community-based village nurseries using marcotting/grafting to capture mature traits of individual trees and stem cuttings for the multiplication of elite trees as putative cultivars;
- The development of appropriate nursery techniques for the sexual and asexual propagation of candidate species in remote villages;
- The development of participatory priority setting for the selection of candidate species for domestication and integration into agroforestry systems. Some 50 local species were identified for further research and development around the tropics and sub-tropics;
- The establishment of Rural Resource Centres to provide: (i) knowledge and skills for the participatory domestication of local species using appropriate, low-technology techniques adapted for use in remote locations with minimal infrastructure in ways that allow local community members to benefit from their own initiatives and (ii) the capacity to develop community engagement and infrastructure to maximize environmental, social and economic benefits;
- The quantification at the village level of 3- to 10-fold continuous tree-to-tree intraspecific variation in community farmland to understand the range of genetic variation available to local communities and its accordance with local knowledge. Subsequently, this knowledge was formulated to identify market-specific ideotypes. Primarily, it was morphological variation that was investigated, but this was later expanded into nutritional and other biochemical traits;
- The start of the evaluation of genetic variation using molecular technologies;
- The examination of communal, socio-economic, legal and political issues affecting both the adoption and impact of domesticating indigenous food and non-food tree species and the marketing of their Agroforestry Tree Products (AFTPs).
- Improved capture of ontogenetically mature phenotypes by better understanding of the physiology of grafting and marcotting;
- Analysis of variations in nutraceutical, pharmaceutical and other ingredients of AFTPs to meet the needs of new market opportunities and the identification of market-oriented ideotypes;
- Greater investment in postharvest processing to expand local, regional and global trade opportunities;
- Investigation of reproductive biology for increased use of controlled breeding in centralized tree domestication research;
- Upscaled tree domestication, especially in Africa, focusing on species with impact on income generation and nutrition;
- Impact analysis based on well-defined criteria and indicators;
- A better understanding of the role of domesticated agroforestry trees in the achievement of sustainable multifunctional farming systems and wider local and regional marketing;
- Expanded opportunities for successful marketing of AFTPs, including public–private partnerships in commercial markets;
- Recognition of intellectual property rights to protect poor farmers and local communities from unscrupulous entrepreneurs;
- Enhance policy support for the upscaling of intensified agroforestry systems.
Progress in the Third Decade
2. Overview of the Literature
2.1. Regional
2.2. Research Topics
2.3. Species
3. Advances in Domestication Technologies and Their Application
4. Pan-African Priority Species
4.1. Adansonia digitata (Baobab)
4.1.1. Ethnobotany, Uses and Natural Resources
4.1.2. Genetic Variation and Domestication
Phenotypic Characterization and Provenance Variation
Genetic Variation
Domestication
4.1.3. Commercialization of Products
Marketing Concerns
4.2. Sclerocarya birrea (Marula)
4.2.1. Ethnobotany, Uses and Natural Resources
4.2.2. Genetic Variation and Domestication
4.2.3. Commercialization of Products
4.3. Vitellaria paradoxa (Shea Nut)
4.3.1. Ethnobotany, Uses and Natural Resources
4.3.2. Genetic Variation and Domestication
4.3.3. Commercialization of Products
4.3.4. Post-Harvest Storage
4.3.5. Impacts and Multiple Benefits
4.4. Allanblackia Species (Tallow Tree)
4.4.1. Ethnobotany, Uses and Natural Resources
4.4.2. Genetic Variation and Domestication
4.4.3. Commercialization of Products
4.5. Tamarindus indica (Tamarind)
4.5.1. Ethnobotany, Uses and Natural Resources
4.5.2. Genetic Variation and Domestication
4.5.3. Commercialization of Products
4.6. Zizyphus species (Ber)
4.6.1. Ethnobotany, Uses and Natural Resources
4.6.2. Genetic Variation and Domestication
4.6.3. Commercialization of Products
4.7. Prunus africana (Pygeum)
4.7.1. Ethnobotany, Uses and Natural Resources
4.7.2. Genetic Variation and Domestication
5. Humid Lowlands of West and Central Africa
5.1. The State of Natural Resources and Their Governance and Management
5.1.1. Governance Issues
5.1.2. Management Issues
5.2. Ethnobotany of Food and Medicinal Species for Cultivation
- Local management practices and socioeconomic factors affecting farmers’ strategies for cultivating species were documented on candidate species selected for domestication during the first two decades: Irvingia gabonensis [233], Dacryodes edulis [242] and Garcinia kola [196,243,244]. Farmers have developed a set of quantitative and qualitative criteria to segregate these species and recognize them as “locally acknowledged morphotypes (LAM)” or ethnovarieties. Market integration and other economic opportunities were found to be the most important factors influencing farmers’ decision to maintain and intensify the cultivation of preferred ethnovarieties in their farms. Moreover, social networks for seed and planting material exchange, including ethnically and gender-differentiated uses were found to contribute to gene flow and the conservation of high genetic diversity despite the selection, urbanization and agricultural intensification associated with the domestication process [245]. Furthermore. perceptions of and preferences for fruit traits linked to intraspecifc tree diversity vary according to interethnic and rural–urban differences, which need to be considered in future domestication activities [246].
- Local use and socioeconomic importance were documented, as well as the pressure on natural stands due to overexploitation and unsustainable management of food, medicine and other services from Baillonella toxisperma, a multipurpose food, medicinal and timber species in Cameroon [247]; Garcinia lucida, a medicinal species in Cameroon [248]; Xylopia aethiopica, a tree species used as food, spice and medicine in Benin and other Central and West African countries [249]; Gnidia glauca, a medicinal tree species in Cameroon [198]; Cola spp., a group of food, medicinal and ritual species in Benin [250,251]; and Canarium schweinfurthii, a multipurpose tree species used for food, ritual and medicinal purposes [252,253,254,255]. This has provided evidence of unsustainable exploitation and has led to recommendations for the domestication of these species to create an alternative source of products.
- Many species locally threatened by deforestation, land use change and unsustainable exploitation for food, medicine, fibre and other services, have little-known resource bases, habitats and unrecorded local knowledge [192,227,256]. The key challenges to sustainability that were identified were: unfavourable cultural beliefs [233,249], indiscriminate and illegal logging, low accessibility and low acceptability, as well as inadequate research on their cultivation [257]. Criteria were designed and used to assess the sustainability of wild harvesting based on biological type, part used, habitat type and status, popularity and stand structure. Overexploited and threatened species were classified as vulnerable and have been recommended for domestication [192,198,227,256].
- Indigenous fruits are consumed by the members of the majority of households in Cameroon, as they are recognized for their nutritious value [258,259,260]. In addition, the study examined the relationship between food insecurity and deforestation and found that rural people in the deforested agricultural areas close to towns and cities had the greatest food insecurity due to the absence of nutritious forest foods [261]. The consumption of wild forest food is not associated with any stigma of poverty [262]. The authors suggested that the culinary uses of indigenous foods should be widely promoted to improve food security [262].
5.3. Commercial Value of Non-Timber Forest Products in Local Markets
5.4. Priority Setting for Domestication/Commercialization
5.5. Characterization of Useful Traits
5.6. Assessments of Genetic Variation
5.6.1. Provenance Studies
5.6.2. Molecular Studies
5.7. Nutritional Value of Non-Timber Forest Products
5.8. Medicinal Value of Wild Non-Timber Forest Products
5.9. Selection of Elite Trees and Ideotypes
5.10. Nursery Development and Improved Planting Stock
5.11. Vegetative Propagation
5.12. Post-Harvest Issues
5.13. Enterprise Development
5.14. Upscaling and Capacity Building—The Role of Rural Resource Centres
6. Sahel and North Africa
6.1. The State of Natural Resources and Their Governance and Management
6.2. Ethnobotany of Food and Medicinal Species Candidates for Cultivation
6.3. Commercial Value of Non-Timber Forest Products in Local Markets
6.4. Priority Setting for Domestication/Commercialization
6.5. Characterization of Useful Traits
6.6. Assessment of Genetic Variation and Its Characterization
6.6.1. Provenance Studies
6.6.2. Molecular Studies
6.7. Nutritional Value of Non-Timber Forest Products
6.8. Medicinal of Non-Timber Forest Products
6.9. Selection of Elite Trees and Ideotypes
6.10. Nursery Developments and Improved Planting Stock
6.11. Vegetative Propagation
6.12. Post-Harvest Issues
6.13. Upscaling and Capacity Building
7. Highlands and Drylands of East Africa
7.1. State of Natural Resources and Their Governance and Management
7.2. Ethnobotany of Food and Medicinal Species for Cultivation
7.3. Commercial Value of Non-Timber Forest Products in Local Markets
7.4. Priority Setting for Domestication/Commercialization
7.5. Characterization of Trees
7.6. Assessment of Genetic Variation
7.7. Nutritional Value of Non-Timber Forest Products
7.8. Medicinal Value of Non-Timber Forest Products
7.9. Nursery Development and Improved Planting Stock
7.10. Vegetative Propagation
7.11. Trade and Law
7.12. Local Impacts of Cultivation and Marketing of Tree Products
8. Savannah and Miombo Woodlands of Southern Africa
8.1. The State of Natural Resources and Their Governance and Management
8.2. Ethnobotany of Food and Medicinal Species for Cultivation
8.3. Commercial Value of NTFPs in Local Markets
8.4. Priority Setting for Domestication/Commercialization
8.5. Characterization of Useful Traits
8.6. Assessment of Genetic Variation
8.7. Nutritional Value of Non-Timber Forest Products
8.8. Medicinal Value of Non-Timber Forest Products
8.9. Selection of Elite Trees and Ideotypes
8.10. Nursery Developments and Improved Planting Stock
8.11. Vegetative Propagation
8.12. Community Action
8.13. Post-Harvest Issues
8.14. Enterprise Development
8.15. Trade and the Law
8.16. Local Impacts of Cultivation and Marketing
9. Adoption, Outcomes and Impact
10. Policy Relevance
11. Towards the Fourth Decade
12. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Number | Research Topic |
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1 | The state of natural resources and their genetic diversity, governance and management—understanding the issues/constraints. |
2 | Ethnobotany of food and medicinal species candidates for cultivation—including their role in diets, health and food security. |
3 | Commercial value of non-timber forest products (NTFPs) in local markets. |
4 | Nutritional/medicinal value of wild NTFPs. |
5 | Priority setting for domestication/commercialization—species preferences. |
6 | Characterization of useful traits: morphological and physical. |
7 | Assessments of genetic variation and its characterization. |
8 | Germplasm, germination and reproductive biology. |
9 | Vegetative propagation of candidate species. |
10 | Selection of elite trees and ideotypes. |
11 | Product commercialization—evaluation/marketability and processing. |
12 | Domestication concept and strategy. |
13 | Testing of putative cultivars. |
14 | Farmer capacity building—role of Rural Resource Centres, etc. |
15 | Implementation of participatory principles. |
16 | New techniques, skills and strategies (including support for gender issues). |
17 | Nursery developments and improved planting stock. |
18 | Post-harvest issues. |
19 | Protection of Traditional Knowledge and Intellectual Property Rights. |
20 | Trade and the law. |
21 | Local impacts of cultivation and marketing of Agroforestry Tree Products (AFTPs). |
22 | Potential regional and international impacts of cultivation and diversification of farming systems and agroecology. |
23 | Policy relevance to upscaling rural/urban development and to global sustainability (hunger, malnutrition, poverty, wildlife habitat, livelihoods and social equity, social justice, economic development, etc.). |
Humid Lowlands of West and Central Africa | Sahelian Drylands of West and North Africa | Highlands and Dryland of East Africa | Savannah and Miombo Woodlands of Southern Africa |
---|---|---|---|
Allanblackia spp. | Vitellaria paradoxa | Adansonia digitata | Sclerocarya birrea |
Prunus africana | Adansonia digitata | Allanblackia stuhlmannii | Adansonia digitata |
Irvingia spp. | Sclerocarya birrea | Zizyphus mauritiana | Azanza garckeana |
Dacryodes edulis | Tamarindus indica | Vitellaria paradoxa | Uapaca kirkiana |
Garcinia kola | Zizyphus mauritiana | Ficus natalensis | Strychnos spinosa |
Cola spp. | Azanza garckeana | Balanites aegyptiaca | Strychnos cocculoides |
Gnetum spp. | Moringa oleifera | Albizia coriaria | Dovyalis caffra |
Ricinodendron heudelotii | Borassus aethiopum | Markhamia lutea | Vangueria infausta |
Chrysoplyllum albidum | Carapa procera | Tamarindus indica | Parinaria curatellifolia |
Tetrapleura tetraptera | Parkia biglobosa | Vitex doniana | Sizygium cordatum |
Canarium schweinfurthii | Vitex doniana | Vitex mombassae | Vitex spp. |
Pentaclethera macrophylla | Dalium guineense | Sclerocarya birrea | Flacourtia indica |
Baillonella toxisperma | Garcinia kola | Zizyphus mauritiana | |
Trichoscypha aciminata | Xylopia aethiopica | ||
Afrostyrax lepidophyllus | Detarium microcarpum | ||
Gnidia glauca | Balanites aegyptiaca | ||
Pausinystalia johimbe | Prosopis africana | ||
Tetracarpidium conophorum | Argania spinosa | ||
Garcinia lucida | Irvingia gabonensis | ||
Gambeya africanum |
Decentralized Participatory Approach | Centralized Laboratory Approach |
---|---|
Leakey [14,15,18,29] | Dawson et al. [26,30] |
Takoutsing et al. [31] | Hendre et al. [24] |
Degrande et al. [19,20] | McMullin et al. [27] |
Essougong et al. [32] | Jamnadass et al. [33] |
Wouapi et al. [34] |
Towards the Third Decade | Towards the Fourth Decade |
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Share and Cite
Leakey, R.R.B.; Tientcheu Avana, M.-L.; Awazi, N.P.; Assogbadjo, A.E.; Mabhaudhi, T.; Hendre, P.S.; Degrande, A.; Hlahla, S.; Manda, L. The Future of Food: Domestication and Commercialization of Indigenous Food Crops in Africa over the Third Decade (2012–2021). Sustainability 2022, 14, 2355. https://doi.org/10.3390/su14042355
Leakey RRB, Tientcheu Avana M-L, Awazi NP, Assogbadjo AE, Mabhaudhi T, Hendre PS, Degrande A, Hlahla S, Manda L. The Future of Food: Domestication and Commercialization of Indigenous Food Crops in Africa over the Third Decade (2012–2021). Sustainability. 2022; 14(4):2355. https://doi.org/10.3390/su14042355
Chicago/Turabian StyleLeakey, Roger R. B., Marie-Louise Tientcheu Avana, Nyong Princely Awazi, Achille E. Assogbadjo, Tafadzwanashe Mabhaudhi, Prasad S. Hendre, Ann Degrande, Sithabile Hlahla, and Leonard Manda. 2022. "The Future of Food: Domestication and Commercialization of Indigenous Food Crops in Africa over the Third Decade (2012–2021)" Sustainability 14, no. 4: 2355. https://doi.org/10.3390/su14042355
APA StyleLeakey, R. R. B., Tientcheu Avana, M.-L., Awazi, N. P., Assogbadjo, A. E., Mabhaudhi, T., Hendre, P. S., Degrande, A., Hlahla, S., & Manda, L. (2022). The Future of Food: Domestication and Commercialization of Indigenous Food Crops in Africa over the Third Decade (2012–2021). Sustainability, 14(4), 2355. https://doi.org/10.3390/su14042355