Flooding and Food Security: The Urgent Need for Research
URBANA, Illinois, US, October 28 (IPS) - Recently, countries around the world, including the United States of America, celebrated the United Nations 2026 World Food Day. This year’s theme, “Innovate Today. Nourish Tomorrow,” highlighted how efforts to foster innovation and forward-thinking solutions can help to ensure that everyone in our world has access to sufficient, diverse, safe, and nutritious foods while safeguarding the planet for future generations.
But realizing this vision and developing forward-thinking solutions to help nourish 9 billion people including the 645 million people who still face hunger, requires recognizing and investing in research on emerging agricultural challenges, specifically those that remain overlooked and underestimated.
Arguably, flooding is one of the emerging yet underestimated and underappreciatedthreats to important agricultural crops, including rice and corn, and to food security, which has increased in frequency and intensity in recent years because of climate change.
Globally, between 2008 and 2018, according to a Food and Agriculture Organization of the United Nations report, flooding was ranked as the second driving factor resulting on crop production losses.
Flooding deprives soil and plant roots of oxygen, a necessary ingredient for all plant-sustaining life processes, including water uptake, respiration, and photosynthesis. Consequently, plants’ cellular, physiological, metabolic, and biochemical processes are disrupted, impacted, and impaired. Without oxygen, plants’ growth and development is impacted, and if flooding persists for days, they suffocate and die.
Sadly, many of the currently grown agricultural crop varieties cannot withstand flooding and crop and yield losses of up to 100 percent have been reported both nationally and globally. Crops and yield losses arising because of flooding translate into economic losses and ultimately food insecurity.
Alarmingly, flooding also negatively impacts soil biology, chemistry, functioning, quality, and microbial communities while disrupting the many beneficial relationships plants form with microbes, relationships that help plants deal with other stressors and promote growth and resilience.
Concerningly, flooding is a complex, sequential plant stressor, and its negative impacts on crops persist even after floodwaters recede. After floodwater subsides, agricultural crops enter the second phase of flooding stress, referred to as the post-flooding stress phase.
During the post-flooding stress phase, plants face additional stresses, including reoxygenation and dehydration, impaired root function, and nutritional deficiencies due to altered nutrient uptake. At the same time, plants are vulnerable to pathogens, diseases, and pests, threats that can collectively lead to agricultural crop losses.
The good news, however, is that science, research, and scientific discoveries can provide the forward-thinking solutions needed to safeguard our food systems against emerging threats.
But for research to provide these solutions, researchers working to address these questions must be funded.
Take the case of flooding. With funding and investments, researchers can pursue multiple research pathways to understand flooding while also pursuing bold and innovative ideas with the goal of developing and advancing science-based solutions to mitigate the negative and detrimental impacts flooding has on agricultural crops and soils that underpin plant and ecosystem health.
First, scientists can build a comprehensive understanding of flooding, including discovering the many strategies plants use to resist and recover from flooding and post-flooding stress.
Second, researchers can pursue both short- and long-term field-based experiments that incorporate thousands of crop varieties, including wild varieties, across different soil types to establish a more comprehensive understanding of flooding and post-flooding impacts on plant and soil health, biology, chemistry, and microbes, as well as the legacy and cascading effects of flooding.
Concurrently, this research can identify microbial taxa, communities, functions, and traits that improve flooding tolerance. Additionally, researchers can work to determine whether the current management practices that have been put in place to protect soil health and help plants resist biotic and abiotic threats, including regenerative practices, are keeping pace with intensifying flooding events.
Third and most importantly, with funding, scientists from multiple disciplines, including plant biology, entomology, engineering, agronomy, microbial ecology, predictive modelling, breeding, and soil health biology, can collaborate to design innovative solutions and accelerate the discovery of new solutions to flooding.
Ultimately, mitigating threats like flooding that could derail and undermine progress toward building climate-resilient crops and improving soil health and biology requires a comprehensive understanding of flooding and its impact on soil health, biology, and plants.
With sufficient funding and investment, scientists, in collaboration with stakeholders, can develop transformative solutions to address flooding and fulfill 2026 World Food Day theme “Innovate today. Nourish tomorrow.” Time is of the essence.
Esther Ngumbi, PhD, is an Associate Professor in the Department of Entomology at the University of Illinois Urbana Champaign.
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