Inheritance of Resistance to Tomato Yellow Leaf Curl Virus Derived from Lycopersicon cheesmanii and Lycopersicon hirsutum

Abstract

Inheritance of resistance to tomato yellow leaf curl virus (TYLCV) was studied in the interspecific crosses Lycopersicon escutentum Mill. cv. UC 82 x Lycopersicon cheesmanii ssp. minor (Hook) C.H. Mill. LA 1401, and Lycopersicon esculentum cv. VF 145-B-7879 x Lycopersicon hirsutum Humb. and Bonpl. LA 386. Genetic populations were artificially inoculated with TYLCV prior to transplanting, and were later evaluated under field conditions. Reaction of parents, F 2 and F 3 plants, and backcrosses of resistant F 2 plants to UC 82, indicated that resistance derived from L. cheesmanii seems to be recessive. Narrow sense heritability (NSH) was 0.44. Reaction of parental F 1 , F 2 , and backcross plants indicated that resistance derived from L. hirsutum is dominant and controlled by more than one gene.