Inheritance and genetic mapping of cucumber mosaic virus resistance introgressed from Lycopersicon chilense into tomato

摘要: Cucumber mosaic virus (CMV) infects a wide variety of crop plants and in tomato (Lycopersicon esculentum Mill.) causes significant economic losses many growing regions, particularly the Mediterranean. The objective present study was to identify number map locations genes controlling resistance CMV breeding lines (BC1–inbreds) derived from related wild species L. chilense. These also carried gene Tm-2 a for ToMV, which facilitated interpretation disease symptoms. segregation BC2F1 BC2F2 generations, following mechanical inoculation with subgroup-I isolates, consistent expectations single dominant gene, symbol Cmr (cucumber resistance) given. Resistant susceptible BC1-inbreds were analyzed RFLP isozyme markers genomic regions introgressed only chilense-specific found on chromosome 12; some resistant contained introgression comprising entire short arm part long this chromosome, while others recombinant derivative introgression. 12 significantly associated both qualitative quantitative models inheritance. analysis, however, demonstrated that not expressed as reliable monogenic character, suggesting lack penetrance, environmental effects, or existence additional (undetected) factors. In marker interval TG68 – CT79 showed most association resistance. No between observed. are potentially useful sources improvement, context knowledge location should accelerate by marker-assisted selection.