Abstract
The amount of recombination in three different intraspecific crosses of the wild tomato species Lycopersicon peruvianum was investigated for the short arm of chromosome 6 that harbors the Mi nematode resistance gene and the centromeric region of chromosome 9 that contains the Tm2a virus resistance gene. These two genes have been introgressed into the cultivated tomato and are associated with a significant reduction in recombination in the respective region when crossed to other L. esculentum lines. For both regions and all crosses within L. peruvianum significantly more recombination (up to more than ten fold) was observed in the gametes derived from the female parent than in those from the male parent. In general, the differences were more pronounced for chromosome 6 than for chromosome 9. The amount of recombination in the three intraspecific L. peruvianum crosses was compared with the amount of recombination observed in the standard interspecific cross used for the construction of a saturated genetic map of tomato (L. esculentum x L. pennellii). In two of three cases for each region, more recombination was observed in the intraspecific crosses and in one case for each region significantly less recombination was found in the intraspecific cross when compared to the interspecific cross. Specifically for the Mi-carrying region, crosses within L. peruvianum exhibited up to 15-fold more recombination than crosses between resistant and susceptible L. esculentum lines, and such crosses will allow the fine mapping of this gene for the purpose of map-based cloning.
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Ganal, M.W., Tanksley, S.D. Recombination around the Tm2a and Mi resistance genes in different crosses of Lycopersicon peruvianum . Theoret. Appl. Genetics 92, 101–108 (1996). https://doi.org/10.1007/BF00222958
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DOI: https://doi.org/10.1007/BF00222958