Tolerance to Tomato Yellow Leaf Curl Virus Derived from Lycopersicon peruvianum

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Abstract
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.