Gene Combinations Provide Durable Resistance to Begomoviruses in Tomato

Begomoviruses are some of the most damaging threats to tomato crops globally. To fight these viruses, scientists breed specific protective genes, known as Ty-genes, into tomato plants. However, relying on just one of these genes often is not enough to stop the most aggressive virus strains. This led Kindai University researchers to test several commercial tomatoes and special breeding lines from the World Vegetable Center against three different viruses of varying strengths to see which genetic combinations worked best.

The results showed that not all resistance genes are created equal. Plants carrying only the Ty-2 gene were susceptible to all viruses tested, whereas those with Ty-1 could tolerate weaker viruses but were overwhelmed by stronger ones. The most successful results were achieved by two specific breeding lines, AVTO1919 and AVTO1920. By combining two specific genes, Ty-1 or Ty-3 alongside Ty-6, and ensuring they were inherited from both parent plants, these tomatoes showed almost no symptoms and extremely low virus levels.

This discovery is a major step forward for sustainable farming. It proves that stacking these specific genes creates a much stronger, broader shield for tomatoes. This strategy provides breeders with a proven roadmap to develop hardier, more durable tomato varieties that can survive even the most aggressive disease outbreaks worldwide.

Know more findings from Euphytica.