Mexico Bans GM Corn Cultivation in Constitutional Reform: Action Follows Trade Ruling That Ignored Evidence of Genetic Contamination

Biodiversity, Civil Society, Economy & Trade, Food and Agriculture, Food Systems, Headlines, Health, Indigenous Rights, Latin America & the Caribbean, TerraViva United Nations

Opinion

Credit: Michael Farrelly, AFSA

CAMBRIDGE, MA., Apr 30 2025 (IPS) – On March 17, Mexican President Claudia Scheinbaum signed into law a constitutional reform banning the cultivation of genetically modified (GM) corn. The action followed a December ruling by a trade tribunal, under the U.S.-Mexico-Canada (USMCA) trade agreement, in favor of a U.S. complaint that Mexico’s 2023 presidential decree, with broader restrictions on the consumption of GM corn, constituted an unfair trade practice by prohibiting the use of GM corn in tortillas.


The Mexican government publicly disagreed with the ruling, claiming that the three arbitrators had failed to consider the scientific evidence Mexico presented in the yearlong case. But the government chose to comply, rescinding the three specific parts of the decree deemed to limit future GM corn imports. Still, the government left intact the decree’s measures phasing out the use of the herbicide glyphosate, establishing a protocol for tracking GM corn imports into the country, and banning the cultivation of GM corn in the country.

The constitutional amendment enshrines that last measure in a more permanent manner. While GM corn has faced planting restrictions for more than a decade, the constitutional ban represents an important act of resistance and sovereignty, particularly in light of the flawed decision by the tribunal.

Trade panel fails to consider evidence

Corn is central to Mexico’s agriculture, cuisine, nutrition, and culture. Mexico is the center of origin for corn, where the crop was domesticated thousands of years ago. It remains at the core of the country’s farming, diet, and culture. As President Sheinbaum acknowledged in approving the constitutional ban on GM corn cultivation, “Sin maiz no hay pais” – without corn there is no country.

In defense of Mexico’s 2023 decree, the panel acknowledged that the government presented scientific evidence from qualified and reputable sources of “risks to human health arising from the direct consumption of GM corn grain in Mexico, and risks to native corn of transgenic contamination arising from the unintentional, unauthorized, and uncontrolled spread of GM corn in Mexico.” (That evidence is summarized in an extensive publication from Mexico’s national science agency.)

The trade tribunal dismissed concerns about such risks in its ruling, essentially giving itself a pass on reviewing the scientific evidence of human-health risks by arguing that Mexico had not conducted an approved risk assessment “based on relevant scientific principles,” a reference to prevailing international codes for such processes.

The panel also failed to evaluate the risks to native corn. Mexico presented strong evidence that GM corn has cross-pollinated native corn varieties, gene flow that threatens to undermine the genetic integrity of the country’s 64 “landraces” and more than 22,000 varieties adapted by farmers over millennia to different soils, altitudes, climates, foods, and customs.

The tribunal argued that no special protection from GM corn was needed because gene flow already takes place from non-GM hybrid varieties of corn, and GM contamination is no different from non-GM gene flow. “Mexico has not demonstrated how the threat to the traditions and livelihoods of indigenous and farming communities from GM corn is greater than the threat posed by non-native, non-GM corn,” the panel wrote. Cross-pollination from hybrid corn “could equally threaten the genetic integrity of native corn.”

Equating contamination from GM corn with that of hybrid corn is a serious misreading of the science and of Mexico’s culture. GMOs by definition – and by explicit definitions in the constitutional amendment – involve crossing species boundaries, introducing, for example, a gene from a bacterium into a corn plant to repel insects. In contrast, hybrid corn is produced by cross-breeding different corn varieties, the resulting offspring remaining pure corn, with no non-corn genes in its DNA.

Mexican farmers have a long history of developing some of their own cross-pollinated varieties, intentionally combining a native variety with a hybrid that has properties the farmer desires. Such cross-pollination has nothing in common with unwanted contamination from GM corn, imposed on farmers without their informed consent. They call it “genetic pollution.”

It can pose a long-term risk to native varieties. Transgenic traits do not always reveal themselves after contamination. That means farmers can unknowingly spread such contamination from their pollen year after year to other corn plants. Mexican researchers discovered such contamination in their 2013 survey of native corn varieties. Biotechnologist Antonio Serratos reported that some of the native varieties he found even within Mexico City had transgenic traits in their DNA.

“In Mexican fields, transgenic native maize is being created,” he told me at the time. ”If [GM] maize seeds are sold or exchanged, the contamination will grow exponentially. That is the point of no return.”

Seed-sharing under threat

The tribunal’s alternative recommendation for controlling unwanted gene flow suggested that “the informal seed exchange practices of indigenous and farming communities” was one of the “underlying issues” Mexico should address to prevent contamination instead of restricting imports.

Limiting seed-sharing is entirely at odds with the science of seed diversity and evolution, says researcher Erica Hagman, who helped prepare Mexico’s defense in the USMCA dispute. Mexico’s rich corn diversity is the direct result of millennia of adaptive practices by farmers in their fields. The tribunal’s suggestion that Mexico should limit such seed-sharing to prevent GM corn contamination runs counter to the practices of in situ conservation of agricultural biodiversity.

Mexico’s constitutional ban on GM corn cultivation ensures that such misguided reasoning will not guide public policy. The amendment was strengthened by proposals from civil society that extended the ban to new genetically engineered seeds by banning any crops “produced with techniques that overcome the natural barriers of reproduction or recombination, such as transgenics.” This limits some of the new generations of genetically engineered crops.

While the constitutional reform does not include some of the original language restricting GM corn consumption, no doubt in deference to the trade ruling, the final version shows a clear preference for non-GM crops, leaving the door open to tighter regulation.

Tania Monserrat Téllez from the Sin Maíz No Hay País coalition called the reform “a major step forward for the defense of native corn varieties, the health of the Mexican population, and the protection of Mexico’s biocultural heritage associated with corn.”

Timothy A. Wise is the author of Eating Tomorrow: Agribusiness, Family Farmers, and the Battle for the Future of Food (New Press 2019) and a researcher at Tufts University’s Global Development and Environment Institute.

IPS UN Bureau

  Source

How to Put the ‘Sexy’ Back into Agriculture – Thoughts From CGIAR Science Week

Africa, Biodiversity, Climate Change, Conferences, Cooperatives, Development & Aid, Economy & Trade, Editors’ Choice, Environment, Featured, Food and Agriculture, Food Security and Nutrition, Food Sustainability, Food Systems, Global, Headlines, Population, Poverty & SDGs, Sustainable Development Goals, TerraViva United Nations, Trade & Investment

Food Systems

Dr Ismahane Elouafi, Executive Managing Director of CGIAR. Credit: Busani Bafana

Dr Ismahane Elouafi, Executive Managing Director of CGIAR. Credit: Busani Bafana

NAIROBI, Apr 11 2025 (IPS) – This week presented a beacon of hope for young people so that the “girl from the South and the boy, of course” could stay in the developing world, Dr Ismahane Elouafi, Executive Managing Director of CGIAR, said during a press conference on the final day of the CGIAR Science Week.


Science and innovation could whet their appetites, especially as research and innovation can change the perception that it is a drudgery-filled occupation to one where there is room for ambition – and it made business sense.

“In the face of slow productivity and rising risks, the case is clear. Investing in agricultural research is one of the smartest and most future-proof decisions that anyone can make,” she said.

Elouafi, along with the other panellists Dr Eliud Kiplimo Kireger, the Director General of KALRO and Eluid Rugut, a youth agri-champion at the Ban Ki-moon Centre, alluded to the broad value chain of agriculture, which will make it attractive to young people.

Dr Eliud Kiplimo Kireger, the Director General of KALRO. Credit: Busani Bafana/IPS

Dr Eliud Kiplimo Kireger, the Director General of KALRO. Credit: Busani Bafana/IPS

Kireger commented that people say, “Agriculture is not sexy, and so we need to make it sexy,” and encourage young people into science. Apart from encouraging young kids into science, there was a space in it for young people who don’t want to see returns on their investments in years but in months.

Rugut’s personal experience backs the claim up; he told the press conference that he first had to convince his father to give him a little land – and this wasn’t an easy task. Rugut, who represents both the youth and a smallholder, said it was only once his father saw the benefits of the new technologies that he was prepared to give his son the benefit of the doubt.

“It was very hard to convince my dad to give us land, but over time, these technologies that I was trying to bring to the farm – like drip irrigation, water pumps and drought-tolerant seeds,” Rugut said, but in the end, “I was able to convince him. Also, my mom was able to convince him.”

Kireger said the week-long conference had shown the power of collaboration, especially because research was expensive and the need was great. However, digitisation had meant that a lot of the research was no longer stuck in the labs and was now in the hands of farmers.

and Eluid Rugut, a youth agri-champion at the Ban Ki-Moon Centre. Credit: Busani Bafana/IPS

Eluid Rugut, a youth agri-champion at the Ban Ki-Moon Centre. Credit: Busani Bafana/IPS

He encouraged farmers (and the journalists at the conference) to take a look at the Google Play store, where there are KALRO apps.

“So, if you go to Google Play Store, you will find many KALRO apps which you can download onto your phone. So, if you’re a coffee farmer, for example, you can download a guide on your phone.”

This digitisation is key to scaling research and making it accessible.

Elouafi, too, said investment in agribusiness was crucial to transforming the sector There was a need for public-private partnerships so farmers were no longer only involved in production but down the value chain too.

“So strategic investment in agricultural research isn’t just necessary; it is economically smart. We have seen a USD 10 return on every dollar spent on research and development in the agriculture sector.”

She provided several examples. Participating in the value chain could transform USD 300 of wheat into USD 3000 through pasta production. Likewise with quinoa, millet and sorghum, which cost USD 4 in the market, with production, can fetch USD 50 to USD 100 per kilogram in the market.

This opportunity is where policies and subsidies come in, to put this potential into the hands of the farmers. “This is a gap we need to bridge,” Elouafi said.

Elouafi reported significant progress this week, particularly in addressing food insecurity. The achievements included the launch of the CGIAR research portfolio, the International Potato Centre (CIP) and KALRO biotech agreement, the IWMI water security strategy for East Africa, and the publication of CGIAR’s flagship report, Insight to Impact: A decision-maker’s guide to navigating food system science.

“Science week  has demonstrated the strength of partnerships. How together we can generate powerful tools, innovation, technologies, knowledge, institutions, policies – all of it – to deliver real-world impact for the communities that we serve.

“In the era of fake news and misinformation, our work, our impact, our partnership, and our commitment to the communities we serve are real, and our impact is real, and we need to have a much louder voice. We cannot let it up because the gap will be filled by misinformation.”

IPS UN Bureau Report,