New research shows how common plant viruses may be used to deliver gene-editing instructions, giving scientists more flexible tools to study and improve crops
Plant scientists are looking for faster and more flexible ways to edit crop genomes, especially in plants that are difficult to work with using conventional methods. A new study shows that plant viruses from the potyvirus group can be adapted to carry genome-editing instructions into plants.
By modifying tobacco etch virus and related viral systems to transport CRISPR guide molecules, researchers were able to make targeted edits in model plants and crop species, including tomato and cultivated tobacco. The work broadens the toolkit for virus-induced gene editing and could help researchers develop more adaptable strategies for crop improvement.
Why Delivery Matters in Genome Editing
CRISPR technologies have transformed plant science by giving researchers a precise way to change genes. But one of the biggest challenges is still getting the editing tools into plant cells.
Traditional methods often rely on stable transformation and tissue culture, where plants are edited in the lab and then regenerated from cells or tissues. These approaches can work well, but they are often slow, technically demanding and unavailable for many crop species or varieties.
Virus-induced gene editing offers another option. It uses the natural ability of plant viruses to move through plant tissues and deliver editing instructions. However, not every virus works in every plant, which means researchers need a wider range of viral tools, according to a press release.
A New Use for Potyviruses
The study was conducted by researchers at the Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas–Universitat Politècnica de València, and published on January 20, 2026, in Horticulture Research.
The research focused on potyviruses, a large and diverse group of plant RNA viruses. Because different potyviruses infect different plant hosts, they could give scientists more options for matching a delivery system to a specific crop.
The team developed virus-based tools that can deliver CRISPR RNA guide molecules into plants that already express Cas12a, one of the enzymes used in genome editing. They expanded the approach from tobacco rattle virus to several potyvirus-based systems, including tobacco etch virus, turnip mosaic virus and lettuce mosaic virus.
Testing the System in Plants
To test the approach, the researchers first used a model plant, Nicotiana benthamiana. They targeted a gene whose disruption causes leaves to turn pale or white, making it easy to see whether editing had occurred.
The team compared different guide designs and found that the choice and structure of the guide strongly affected editing success. One design, which included a mobility element from the Flowering locus T gene, improved the chances of passing edits on to the next generation.
The researchers then engineered tobacco etch virus to carry the editing guides through the plant. Because the original form of the virus caused severe symptoms, they tested milder versions. Some of these allowed plants to survive, flower and produce edited tissues. In rare cases, edited offspring that no longer carried the virus were recovered.
Results in Tobacco and Tomato
The strategy was then tested in cultivated tobacco and tomato. In both crops, the researchers achieved substantial editing using tobacco rattle virus and tobacco etch virus systems.
They also applied the same design to turnip mosaic virus and lettuce mosaic virus, showing that multiple potyvirus vectors can support Cas12a-based virus-induced gene editing.
These results suggest that potyviruses could become a useful platform for expanding genome-editing tools across a wider range of plant species.
What the Study Shows
The authors said the study shows how a large and diverse group of plant RNA viruses can be repurposed into practical delivery tools for genome editing.
Potyviruses are especially promising because, together, they infect many plants of agricultural importance. That broad host range could make it easier to develop editing systems for crops that are currently difficult to modify.
The work does not remove all technical barriers. The plants in the study still had to express Cas12a, and heritable editing through seed remained rare. Even so, the results provide a clear path for expanding virus-induced gene editing beyond the small number of viral vectors currently used.
Why It Matters for Crop Improvement
This work could help speed up functional genomics and crop improvement by giving researchers more ways to match viral delivery tools with specific crops.
In the longer term, potyvirus-based systems may support faster testing of gene function, easier recovery of edited plants from infected tissues and new editing strategies for crops that do not respond well to stable transformation.
The study also points to future improvements, including stronger heritable editing, better methods for regenerating virus-free edited plants and smaller editing enzymes that may one day allow fully virus-delivered, transgene-free, tissue culture-free and DNA-free plant genome editing.
For agriculture, that could mean a faster and more accessible path to precise crop improvement.
