The researchers aimed to develop better tomato hybrids with high yield and resistance to Fusarium wilt. They used a specific breeding method called Line × Tester mating design with different tomato lines and testers. The study found that certain hybrid combinations showed higher yield than standard varieties. They also discovered that non-additive gene action was more important for most traits, except plant height. This means that breeding for heterosis is the best way to improve these traits. Certain tomato lines and testers were identified as good general combiners for yield and other important traits.