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Inheritance of Resistance to Tomato Yellow Leaf Curl Virus in Tomatoes. M. Pilowsky, Division of Plant Genetics and Breeding and Virus Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel; S. Cohen, Division of Plant Genetics and Breeding and Virus Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. Phytopathology 64:632-635. Accepted for publication 9 November 1973. DOI: 10.1094/Phyto-64-632.

The inheritance of resistance to the whitefly-borne tomato yellow leaf curl virus (TYLCV) in tomato was studied in progenies derived from crosses between a TYLCV-homozygous resistant line of Lycopersicon pimpinellifolium, LA121, and the susceptible cultivar Pearson of L. esculentum. Inoculations were made by means of the vector, the tobacco whitefly (Bemisia tabaci). Genetic data obtained from the F₁, F₂, F₃ and backcross generations indicated incomplete dominance of resistance over susceptibility, agreeing with a monogenic control of resistance. Transmission tests by means of whiteflies to Datura stramonium suggested that lower virus concns may have been present in plants of the resistant parent than in the susceptible Pearson tomatoes.