Tolerance to Tomato Yellow Leaf Curl Virus Derived from Lycopersicon peruvianum. M. Pilowsky, Department of Plant Genetics and Breeding, Virus Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel. S. Cohen, Virus Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel. Plant Dis. 74:248-250. Accepted for publication 18 August 1989. Copyright 1990 The American Phytopathological Society. DOI: 10.1094/PD-74-0248.

The inheritance of tolerance to tomato yellow leaf curl virus (TYLCV), deriving from the wild tomato Lycopersicon peruvianum, was determined by crossing the cultivated tomato (L. esculentum) line M-60 (TYLCV-tolerant) with line 10 (TYLCV-susceptible). Inoculations were made in F₁, F₂, and backcross populations by means of the vector, the tobacco whitefly (Bemisia tabaci). Genetic data indicated that tolerance was controlled by five recessive genetic factors. Transmission tests by means of whiteflies to Datura stramonium indicated that the tolerant F₁ hybrid commercial cultivar TY-20 was as good a source of the virus as was the susceptible F₁ hybrid cultivar Naama.