As droughts become longer, more frequent, and more unpredictable, the crops that feed the world need to keep up. Drought-resistant crops, varieties bred or developed to maintain yield under water stress, are no longer a niche concern for arid-region farmers. They’re becoming a baseline requirement for agriculture globally.
The seed industry has been working on this for decades. But the pace of progress is accelerating. Here are five of the most drought-resistant crops being developed today, what makes them resilient, and what breeders expect in the next decade.
What Makes a Crop Drought Resistant?
Drought resistance isn’t a single trait. It’s a combination of mechanisms that allow a plant to survive, and ideally still produce, when water is limited. These include deep root systems that access moisture lower in the soil profile, physiological traits that reduce water loss through leaves, the ability to maintain growth during stress periods, and recovery capacity after drought ends.
The most drought-resistant crops tend to combine several of these. Modern breeding programmes use marker-assisted selection, genomic selection, and increasingly AI to identify and stack these traits faster than traditional field methods ever could.
1. Sorghum: The Crop That Laughs at Heat
Sorghum has always been a drought crop. It’s one of the reasons it became a staple across sub-Saharan Africa and the semi-arid regions of Asia. But modern breeding is pushing its resilience considerably further.
Bill Rooney leads what is likely the largest public sorghum breeding programme in the United States at Texas A&M, and his team is working on three interconnected priorities: stay-green drought tolerance, lodging resistance, and nitrogen use efficiency.
Stay-green, the ability of a plant to maintain green tissue and physiological function during and after grain fill, is one of sorghum’s most valuable drought traits. “The traditional approach was often visual selection for stay-green and standability, which was validated by yield productivity in drought-prone environments,” Rooney says. “More recently, marker-assisted selection for stay-green drought tolerance is being used by different programs to maintain a steady level of drought tolerance in elite sorghum germplasm.”
Alongside drought tolerance, Rooney’s team is also improving nitrogen use efficiency and a trait called biological nitrification inhibition, where compounds released by sorghum roots suppress soil bacteria that convert nitrogen into nitrous oxide, a potent greenhouse gas. It’s an example of how drought-tolerance breeding increasingly intersects with broader sustainability goals.
Rooney is cautiously optimistic about the decade ahead. “Given that drought tolerance has always been a priority in sorghum breeding programs, it’s reasonable to expect continued gains at a modest rate in the next few years. If new genomic and phenomic technologies are identified and prioritized, it’s possible that specific significant improvements in drought and lodging tolerance as well as nutrient-use efficiency could be available in new sorghum hybrids within ten years.”
2. Kernza: The Perennial Grain That Never Quits
Most grain crops are annuals. They’re planted, harvested, and the field is tilled again. Kernza® takes a fundamentally different approach: it’s a perennial. Plant it once and it keeps producing for years, with root systems that extend more than ten feet into the soil.
Those deep roots are what make Kernza® genuinely exceptional for drought resistance. While annual grain crops depend on surface moisture and rainfall, Kernza® can access water reserves far below where most crops reach. After harvest, the remaining leaf and stem material is available for cattle grazing, adding an additional dimension of value for producers.
Kernza® was developed through domestication of intermediate perennial wheatgrass, a process led by Lee DeHaan at The Land Institute in Salina, Kansas. Jacob Jungers at the University of Minnesota is leading Kernza® trials and commercialization work, and his team is now focusing on an important question: has intensive selection for agronomic traits inadvertently changed the root architecture that gives Kernza® its drought advantage?
To find out, researchers insert tiny cameras into glass tubes in the soil and photograph roots directly. “Early results are promising,” Jungers reports, with correlations emerging between root traits and genetic markers. This means those root characteristics could be tracked and selected for using genomic tools, rather than the laborious process of digging plants up.
The wheatgrass genome was sequenced around a decade ago, enabling genomic selection and dramatically accelerating breeding timelines. Among perennial grains currently in development, perennial rice is the most advanced, with yields in field trials across China, Southeast Asia, and Africa already matching elite conventional varieties.
3. Drought-Tolerant Maize: This Isn’t Your Grandfather’s Corn
Maize is the world’s most produced crop by volume. It’s also one of the most vulnerable to drought. Yield losses during water stress at key growth stages can be catastrophic. The International Maize and Wheat Improvement Center (CIMMYT), based in Kenya, has spent years building drought tolerance directly into elite maize genetics for smallholder farmers across Africa, and the results in the field are substantial.
In Zimbabwe, households planting CIMMYT’s drought-tolerant maize varieties harvested 617 additional kilograms per hectare compared to conventional varieties, a surplus sufficient to feed a family for over nine months. In Uganda, drought-tolerant varieties increased yields by 15% and reduced the risk of crop failure by 30% in drier regions. In Malawi, yield increases of 44% were recorded alongside a meaningful acceleration in hybrid adoption, with the average variety age dropping from 14 years to 10 years between 2014 and 2021.
The breeding work behind these results is anything but simple. “CIMMYT’s breeding program uses cutting-edge technologies such as double haploid technology, molecular markers, pedigree breeding and transgenic methods, where national policies permit,” says Yoseph Beyene of CIMMYT. “Additionally, genomic selection predicts the best candidates for high yield under drought and normal conditions, accelerating the breeding process and saving costs.”
CIMMYT also collaborates with U.S.-based seed companies on the development of genetically modified drought-tolerant maize tailored for African conditions, a partnership model that links public research and private deployment in ways that are increasingly common in modern plant science.
Looking ahead, Beyene sees AI as the next major inflection point. “Within the next five to ten years, AI and machine learning will enhance drought-tolerant maize breeding by analyzing phenotypic, genotypic and weather data to develop adaptable lines and hybrids across Africa and beyond.”
4. Cowpea: Small Seed, Big Climate Swagger
Cowpea has been called “the poor man’s meat,” a nutritious, protein-rich legume that grows in poor soils, tolerates extreme heat, and fixes its own nitrogen, improving soil health for subsequent crops. On paper, it sounds like the ideal drought-resistant crop. In practice, the breeding challenge is considerably more complex.
Bao-Lam Huynh at the University of California Riverside leads one of the most active cowpea breeding programmes in the United States, and he’s candid about the difficulty. Unlike some traits that are governed by one or two major genes, drought tolerance in cowpea is affected by multiple loci with small, cumulative effects. On top of that, drought rarely arrives alone. It typically comes paired with heat stress, poor soil nutrition, and pest pressure.
“Our research shows that while biotic resistance in cowpea typically involves major genes, drought tolerance is affected by multiple loci with minor effects,” Huynh says. “This genetic complexity plus variable drought conditions form the biggest breeding challenges to make advances in drought tolerance.”
In California’s Central Valley, the Riverside programme targets a specific constellation of threats: root-knot nematodes, aphids, lygus insects, and Fusarium wilt diseases, all of which cause significant yield and quality losses in standard cultivars. In the Sudano-Sahel region of West Africa, where cowpea is a critical food security crop, the combination of drought, heat, and pests routinely pushes on-farm yields far below known potential.
The team’s approach is to stack resistance genes sourced from African cowpea germplasm into new varieties using bi-parental and multi-parental marker-assisted breeding strategies. “Our cowpea breeding program aims to develop new improved varieties with multiple resistance,” Huynh says. “This effort is enabled by the rich collection of resources developed over years here, including pest biotype collections, field- and lab-based resistance bioassays, genetic markers and germplasm collections of host crop genetic diversity.”
5. Perennial Rice: The Most Advanced Drought-Tolerant Grain in Development
Of all the perennial grains currently in development, rice is the furthest along. Conventional rice is extraordinarily water-intensive, one of the thirstiest major crops on earth. Perennial rice varieties, bred to regrow from their root systems after harvest rather than requiring replanting, change the equation significantly.
Deep perennial root systems access soil moisture more efficiently, reduce the need for standing water during cultivation, and maintain soil structure in ways that annual rice cannot. Field trials across China, Southeast Asia, and Africa have already shown yields matching those of elite conventional varieties, a milestone that took decades of breeding work to reach.
The combination of water efficiency, reduced input costs from no replanting and less tillage, and competitive yield makes perennial rice one of the more compelling drought-adaptation stories in modern agronomy. It is also, alongside Kernza®, an example of a broader shift in thinking: rather than breeding annual crops to survive drought, developing perennial systems that structurally reduce dependence on rainfall in the first place.
The Common Thread
Across all five crops, the same forces are at work. Genomic tools are compressing timelines that once took plant breeders generations. International collaboration is linking public research to private deployment. And there’s a growing recognition that drought tolerance cannot be treated as a single trait in isolation.
The crops feeding the world in 2040 will look significantly different from those grown today. The breeders working on sorghum in Texas, Kernza® in Kansas, maize in Kenya, cowpea in California, and rice across three continents are writing the blueprint now, field trial by field trial, marker by marker.
