Researchers at the John Innes Centre in the United Kingdom, working with Kobe University in Japan, have engineered a plant immune receptor that recognizes two different fungal weapons at once. The fungus in question is Magnaporthe oryzae, which causes blast disease in rice and also threatens wheat and barley.
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Mark Banfield, the John Innes Centre research group leader who led the study, said the team had “discovered something that could lead to a potential intervention on what is the worst fungal disease of cereals.” The proof of principle is early and has so far been shown in isolated wheat cells, not growing plants.
Magnaporthe oryzae and the three crops it threatens
The ScienceDaily report published Oct. 15 describes the target as a devastating fungus that threatens rice, wheat and barley. Rice blast is the most serious fungal disease of cultivated rice, and the John Innes Centre estimates it destroys enough rice every year to feed roughly 60 million people. The same species has spread to wheat and barley in parts of Asia and Africa. According to the centre’s press release, dated Sept. 23, the fungus was first found in Brazil in the 1980s, is not currently in the United Kingdom, and could one day become a threat in northern Europe as the climate changes.
Wheat blast, the form that attacks wheat, has its own research literature, including a review of wheat blast from a genetic and genomic perspective that describes why it is hard to manage, and a separate overview titled Wheat blast: The last enemy of hunger fighters that treats the disease as a food-security problem. Neither is part of the new study, but both explain why a receptor that works against several effectors of one fungus draws attention from plant pathologists who have spent years watching the disease move between continents and crops.
Tandem kinase proteins and the HMA bait
The receptors at the center of the work belong to a relatively newly discovered class called tandem kinase proteins, found inside cereal cells. Some carry an integrated Heavy Metal Associated, or HMA, domain, which works as bait: it binds molecules, known as effectors, that the fungus releases to help infect a plant. Once an effector grabs the bait, the plant detects the invader and switches on its defenses. The researchers used biophysical techniques and crystallography to see at high resolution exactly how HMA domains hold on to blast effectors. The press release names one natural pairing, the wheat receptor Rwt7 and the fungal effector Pwt7.
The study, titled “Engineering plant tandem kinase immune receptors expands effector recognition profiles,” appeared in Science Advances and is indexed under DOI 10.1126/sciadv.aef2426. Daniel Yu is first author, and the authors also include Rafał Zdrzałek, Emi Katayama, Hitomi Akiyama, Lucy Daykin, Nathan Williams, Iwan Goodridge and Soichiro Asuke.
Engineering one receptor to catch two effectors
With the structures in hand, the team changed amino acids at the spot where effectors attach and tested the modified receptors in wheat protoplasts, individual plant cells used as a simplified model. The edited receptors recognized two different fungal effectors tied to infections in wheat and barley, a property the report calls dual specificity and describes as unusual in natural immune receptors. Yu said the results indicate “that this new class of resistance proteins is amenable for engineering purposes.”
Banfield argued that breadth is the point. A receptor that spots several fungal threats gives “the potential for more robust immunity in the field,” because a pathogen then has to change more than one feature to escape detection. The reasoning is evolutionary: a single-target receptor can be defeated when the fungus mutates or drops one effector, whereas a receptor tuned to two effectors forces the pathogen to lose both at once. That is the rationale for building breadth into resistance rather than relying on one match at a time. The centre also describes a longer-term idea of stacking these tandem kinase receptors with the better-known NLR receptors, which are thought to activate immunity differently, producing crops that are harder for the fungus to evolve around.
Next steps and open questions
Most of that is still ahead. The dual-specificity result covers only the wheat- and barley-associated effectors that were tested, and the experiments were run in protoplasts rather than whole plants. Greenhouse testing in intact plants is the next stage, and the centre says precision breeding and artificial intelligence might later help design new HMA specificities, although neither was used in this study. Nothing in the report shows that engineered rice, wheat or barley has been grown, challenged with the fungus or approved for planting.
Readers should therefore take the result as a statement about potential. The work shows that a natural immune receptor can be reshaped on purpose to read more than one fungal signal, and it supplies the structural detail needed to try again with other effectors. Whether that translates into resistant varieties of rice, wheat and barley depends on whole-plant trials that have not been reported.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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