Cloning H13 Insect-Resistance Gene in Wheat Opens New Targets for Precision Crop Protection

A team of researchers from the University of Maryland and their collaborators have successfully isolated and cloned the highly sought-after Hessian fly resistance gene, H13, from the wheat genome. Identifying its exact DNA sequence provides a clearer understanding of how wheat crops recognize and defends against insect attacks. This finding offers a vital foundation for developing pest-resistant wheat varieties, which could significantly reduce crop losses and decrease reliance on chemical pesticides in global wheat production.

Although H13 was known to protect wheat against Hessian fly larvae for nearly half a century, its isolation remained nearly impossible due to the size and complexity of the wheat genome. By combining high-resolution genomic mapping and radiation hybrid mapping, scientists finally isolated H13 and analyzed its interaction with the larvae.

The analysis revealed a lock-and-key mechanism where the H13 immune receptor recognizes a distinct salivary protein secreted by larvae during feeding. Upon recognition, the plant triggers a hypersensitive reaction that causes localized cell death at the feeding site, effectively starving the insect. Researchers suggest this breakthrough provides a molecular framework for precision crop protection, and enabling strategies like marker-assisted breeding and gene-stacking for long-term defense.

You may read the full study from the New Phytologist to learn more.