Independence of the mj Nematode Resistance Gene from 17 Gene Loci in Cucumber

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  • 1 Department of Plant, Soil, and General Agriculture, Southern Illinois University, Carbondale, IL 62901-4415
  • | 2 Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609

Root knot caused by Meloidogyne spp. is an important disease of cucumber. Resistance to M. javanica in cucumber (Cucumis sativus L.) is conferred by the newly discovered mj gene. The objective of this research was to determine whether mj was linked to other genes controlling morphological or disease resistance traits in cucumber. Four inbred lines homozygous for mj (LJ 90430, `Manteo', NCG-198, and NCG-199) were crossed with inbreds (`Coolgreen', M 21, NCG-101, WI 2757, and `Wisconsin SMR 18') to form six families: NCG-101 × LJ 90430, WI 2757 × LJ 90430, NCG-199 × `Wis. SMR 18', NCG-198 × M 21, `Manteo' × M 21, and NCG-198 × `Coolgreen'. F2 progeny were evaluated in all families, and BC1 progeny were evaluated only in the NCG-199 × `Wis. SMR 18' family. Meloidogyne javanica resistance and the 17 other traits controlled by simple genes were evaluated in greenhouse or field tests. None of the 17 genes were linked with mj. Therefore, cucumber breeders interested in nematode resistance should be able to incorporate the trait into lines without having to break linkages with the 17 genes used in this study.

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