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Two allelic or tightly linked genetic factors at the PLRV.4 locus on potato chromosome XI control resistance to potato leafroll virus accumulation

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A novel locus for potato resistance to potato leafroll virus (PLRV) was characterized by inheritance studies and molecular mapping. The diploid parental clone DW 91-1187 was resistant to PLRV accumulation in both inoculated plants and their tuber progeny. The resistance to PLRV accumulation present in DW 91-1187 was not transmitted to any F1 offspring when crossed with a PLRV susceptible clone. Instead, one half of the F1 individuals exhibited undetectable amounts of PLRV as determined by ELISA during the primary infection assay, but accumulated PLRV in their tuber progeny plants. The other half was clearly infected both in the inoculated and tuber-born plants. The inheritance of resistance to PLRV accumulation may be explained by a model of two complementary alleles of a single gene (PLRV.4) or by two complementary genes that are closely linked in repulsion phase. Random amplified polymorphic DNA (RAPD) and inter-simple sequence repeat (ISSR) markers linked to the PLRV.4 locus were selected. The two complementary factors were closely linked in coupling phase to the alternative alleles UBC864600 and UBC864800 of DNA marker UBC864. These markers may be used for marker-assisted selection of genotypes having both factors for resistance to PLRV accumulation. The PLRV.4 locus was mapped to a central position on linkage group XI of the potato molecular map, where no resistance locus has been mapped previously.

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Correspondence to W. Marczewski.

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Communicated by G. Wenzel

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Marczewski, W., Flis, B., Syller, J. et al. Two allelic or tightly linked genetic factors at the PLRV.4 locus on potato chromosome XI control resistance to potato leafroll virus accumulation. Theor Appl Genet 109, 1604–1609 (2004).

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  • Cleave Amplify Polymorphic Sequence
  • Diploid Potato
  • Grey Leaf Spot
  • Minor Quantitative Trait Locus
  • Potato Leafroll Virus