Methods for coupling resistance alleles in tomato

摘要

Disclosed is a Lycopersicon esculentum plant, or part thereof, having reduced drag associated with the introduction of alleles from a member of the Lycopersicon genus that is not from the species of esculentum comprising: a. at least two resistance alleles present in the coupling phase at different loci within its genome, wherein one of said at least two resistance alleles is not the Mi-J allele from L. chilense; and b. at least one wild type Lycopersicon esculentum allele at the Mi or Ty loci of a homologous chromosome. Also disclosed is a Lycopersicon esculentum plant, or part thereof, comprising within its genome at least one tomato yellow leaf curl virus (TYLCV) resistance allele and at least one root knot nematode resistance allele, characterized in that said resistance alleles are present in the coupling phase at different loci on one chromosome and in that said plant is resistant against TYLCV and in that said plant is highly resistant against at least one root knot nematode species selected from the group consisting of Meloidogyne arenaria, Meloidogyne incognita and Meloidogyne javanica and wherein said at least one root knot nematode resistance allele is not the Mi-J allele from L. chilense.