Resistance to Tomato Spotted Wilt Virus in Lettuce

Abstract

Tomato Spotted Wilt Virus (TSWV), a thrips-transmitted virus disease, has become a limiting factor in lettuce ( Lactuca sativa L.) production throughout Hawaii and several other areas of the world. In this study, two partially resistant lettuce cultivars, Tinto and PI 342517 (‘Ancora’), were crossed with the susceptible check cultivar Green Mignonette and to each other. Results of resistance tests of the F 1 and F 2 plants suggest that ‘Tinto’ and PI 342517 have the same genes for resistance and that this resistance is partially dominant.