Gb3 encodes a unique kinase fusion protein conferring greenbug resistance in wheat.

Gb3 encodes a kinase-pseudokinase fusion protein that confers greenbug resistance in wheat, with transgenic expression enhancing resistance and knockout increasing susceptibility.

• Why it matters: Understanding plant resistance genes is limited, hindering development of durable pest defenses in crops. Identifying and characterizing Gb3 fills a critical knowledge gap for sustainable pest management.
• What they did: Researchers cloned Gb3 from wheat and its wild relatives, revealing a MAP3K-like domain, and demonstrated that transgenic Gb3 expression improves resistance while knockout causes susceptibility.
• The result: The study shows that Gb3 mediates greenbug resistance by regulating defensive compounds, providing a valuable genetic resource for breeding aphid-resistant cereal crops.