Leveraging millets for developing climate resilient agriculture

Nourishment beyond grains: unveiling the multifaceted contributions of millets to United Nations Sustainable Development Goals

United Nations General Assembly declared that 2023 will be celebrated as the International Year of Millets. Millets are a group of coarse grains from the Poaceae family that offer numerous benefits that align with various United Nations Sustainable Development Goals (UN SDGs). This review explores diverse contributions of millet cultivation, consumption, and value addition with UN SDGs. The millets help in combating hunger by providing economical sources of essential nutrients and diversifying diets, improving health through mitigating malnutrition and diet-related diseases. Millet's lower water demand and resilience to climatic stress help in sustainable water management. Millets reduce the risks associated with monoculture farming and promote sustainable agricultural practices. Similarly, millet plants need few chemical fertilizers, and the ecological damage associated with these plants is minimized. Millets can prevent soil degradation and conserve biodiversity. They can adapt to diverse cropping systems and support sustainable land practices. Millet cultivation reduces inequalities by empowering smallholder farmers and maintaining economic balance. The cultivation and trading of millets promote partnerships among governments, NGOs, and businesses for sustainable development. The ability of millet to contribute to poverty reduction, hunger alleviation, health improvement, environmental sustainability, and economic development makes millet a sustainable choice for a better world.

Drought resistance strategies in minor millets: a review

MAIN CONCLUSION

The review discusses growth and drought-response mechanisms in minor millets under three themes: drought escape, drought avoidance and drought tolerance. Drought is one of the most prominent abiotic stresses impacting plant growth, performance, and productivity. In the context of climate change, the prevalence and severity of drought is expected to increase in many agricultural regions worldwide. Millets (coarse grains) are a group of small-seeded grasses cultivated in arid and semi-arid regions throughout the world and are an important source of food and feed for humans and livestock. Although minor millets, i.e., foxtail millet, finger millet, proso millet, barnyard millet, kodo millet and little millet are generally hardier and more drought-resistant than cereals and major millets (sorghum and pearl millet), understanding their responses, processes and strategies in response to drought is more limited. Here, we review drought resistance strategies in minor millets under three themes: drought escape (e.g., short crop cycle, short vegetative period, developmental plasticity and remobilization of assimilates), drought avoidance (e.g., root traits for better water absorption and leaf traits to control water loss), and drought tolerance (e.g., osmotic adjustment, maintenance of photosynthetic ability and antioxidant potential). Data from 'omics' studies are summarized to provide an overview of the molecular mechanisms important in drought tolerance. In addition, the final section highlights knowledge gaps and challenges to improving minor millets. This review is intended to enhance major cereals and millet per se in light of climate-related increases in aridity.

Changes in Climate Vulnerability and Projected Water Stress of The Gambia's Food Supply Between 1988 and 2018: Trading With Trade-Offs

Background

The coexistence of under- and overnutrition is of increasing public health concern in The Gambia. Fruits, vegetables and pulses are essential to healthy and sustainable diets, preventing micronutrient deficiencies and non-communicable diseases, while cereals significantly contribute to energy intake. However, environmental changes are predicted to intensify, reducing future yields of these crops if agricultural productivity and resilience are not improved. The Gambia is highly climate-vulnerable and import-dependent, but the extent of its reliance on other climate-vulnerable countries for its supply of nutritionally important crops is currently unknown.

Methods

We used United Nations Food and Agriculture Organization data, with novel origin-tracing algorithms applied, to analyse The Gambia's supply of cereals, fruits, vegetables and pulses between 1988 and 2018. The climate vulnerability of countries was assessed using Notre Dame Global Adaptation Initiative (ND-GAIN) index scores, and projected water stress (2040) assessed using World Resources Institute (WRI) scores. Multilevel generalized linear mixed-effects models were used to identify changes in the overall climate vulnerability and projected water stress of supply.

Results

Between 1988 and 2018, The Gambia's supply of cereals, fruits, vegetables and pulses diversified, with the proportion domestically produced falling (Cereals: 61.4%-27.7%; Fruits: 93.0%-55.7%; Vegetables: 24.6%-16.3%; Pulses: 100.0%-76.0%). The weighted-average ND-GAIN scores improved (indicating less climate vulnerability) for supply of all crops except cereals, but the weighted-average WRI score for supply deteriorated (indicating increased projected water stress) for all crops except vegetables. When just considering imports, weighted-average ND-GAIN scores deteriorated for fruits and cereals while showing no significant change for other food groups, and the WRI score deteriorated for cereals only.

Conclusions

Despite some notable improvements in the environmental vulnerability of The Gambia's supply of nutritionally important crops (particularly vegetables), considerable, and in some cases increasing, proportions of their supply are produced in countries that are vulnerable to climate change and future water stress. This may have implications for the availability, affordability, and hence consumption of these crops in The Gambia, ultimately exacerbating existing nutritional challenges. Exploring the options to strengthen supply resilience-such as altering trade patterns, agricultural techniques and diets-should be prioritized.