Genetic Library Boosts Soybean Resistance, Profits

New pangenome analysis reveals hidden diversity in soybean cyst nematode, paving way for more durable crop protection

Published on Mar. 4, 2026

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Researchers at the University of Illinois Urbana-Champaign have developed the first pangenome for the soybean cyst nematode (SCN), the single biggest threat to soybean crops and a $1.5 billion annual problem. The pangenome reveals extensive genetic diversity in SCN populations, which helps explain why soybean resistance is starting to fail. The findings set the stage for new tools to monitor and potentially control the most virulent SCN types.

Why it matters

Soybean cyst nematode is the most damaging pest for soybean farmers, costing over $1 billion in losses each year. As soybean resistance genes become less effective, this pangenome research provides critical insights into the genetic diversity of SCN that will help develop more durable resistance strategies and potentially new control methods.

The details

The researchers assembled and combined genomes from nine different SCN populations, each representing a distinct 'HG Type' based on their ability to reproduce on different soybean varieties. They found the genetic diversity between these SCN populations is vast, with differences comparable to those between humans and chimpanzees. This diversity allows SCN to quickly evolve and overcome soybean resistance genes. The team is now exploring ways to potentially alter SCN populations themselves, similar to how male-sterile mosquitoes are used to control malaria.

  • The study, 'Pangenome analysis of nine Soybean Cyst Nematode genomes reveals hidden variation contributing to diversity and adaptation,' was published on March 4, 2026.

The players

Matt Hudson

Professor in the Department of Crop Sciences at the University of Illinois Urbana-Champaign and senior author of the study.

Lucas Borges dos Santos

Doctoral student in the Informatics Program at the University of Illinois and lead author of the study.

Kim Walden

Co-author of the study who passed away in 2024 and developed a key breakthrough technique to extract intact DNA from SCN eggs.

Stephanie Porter

Outreach agronomist at the Illinois Soybean Association, which provided funding for the research.

North Central Soybean Research Program

Provided sustained funding for the research.

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What they’re saying

“Soybean cyst nematode remains the most damaging soybean pest in the U.S., costing farmers more than a billion dollars every year. This new pangenome finally gives researchers and breeders a full picture of SCN's genetic diversity and adaptability that can deliver the deeper understanding we need to stay ahead of this pest.”

— Stephanie Porter, Outreach agronomist, Illinois Soybean Association (NationalToday.com)

“If you looked at the differences in DNA between humans and chimps, some of these worms would be humans and some of them would be chimps. The HG Types are very different from each other, and a lot of the genes are specific to each population. They're very, very diverse.”

— Matt Hudson, Professor, Department of Crop Sciences, University of Illinois Urbana-Champaign (NationalToday.com)

What’s next

The researchers are now exploring ways to potentially alter SCN populations themselves, similar to how male-sterile mosquitoes are used to control malaria, in order to reduce reproduction and spread of the most virulent SCN types.

The takeaway

This pangenome research provides critical insights into the extensive genetic diversity of soybean cyst nematode, which is helping explain the breakdown of soybean resistance and setting the stage for the development of new tools to monitor and potentially control the most damaging SCN populations.