Advance in Research on Resistance Breeding of Tomato against Tomato Spotted Wilt Virus

Tomato spotted wilt virus (TSWV) is one of the most damaging pathogens in tomatoes (Lycopersicon esculentum Mill.). TSWV has become a limiting factor for tomato production in China and around the world. A viable method to control TSWV is through the natural resistance resource and genes. The wild tomatoes L. peruvianum and L. chilense are the main resistance resources against TSWV up to now. A single dominant resistance gene locus, Sw-5, originating from L. peruvianum plays a significant role in the tomato breeding for resistance to TSWV. Multiple types of molecular markers linked to the Sw-5 and resistant varieties containing the Sw-5 against TSWV has been subsequently developed. Besides, the virus RNA-mediated gene silencing approach in tomato resistance breeding to TSWV has become a research focus in recent years. Recently the resistance-breaking TSWV isolates overcoming the resistance conferred by the Sw-5 has successively appeared, therefore it is urgent to explore new resistance resources and genes against TSWV.