MAPPING OF RESISTANCE TO THE POTATO CYST-NEMATODE GLOBODERA-ROSTOCHIENSIS FROM THE WILD POTATO SPECIES SOLANUM-VERNEI

A population of diploid potato (Solanum tuberosum) was used for the ge netic analysis and mapping of a locus for resistance to the potato cys t nematode Globodera rostochiensis, introgressed from the wild potato species Solanum vernei. Resistance tests of 108 genotypes of a F-1 pop ulation revealed the presence of a single locus with a dominant allele for resistance to G. rostochiensis pathotype Ro1. This locus, designa ted GroV1, was located on chromosome 5 with RFLP markers. Fine-mapping was performed with RAPD and SCAR markers. The GroV1 locus was found i n the same region of the potato genome as the S. tuberosum ssp. andige na H1 nematode resistance locus. Both resistance loci could not exclud ed to be allelic. The identification of markers flanking the GroV1 loc us offers a valuable strategy for marker-assisted selection for introg ression of this nematode resistance.