A new gene, Ny (tbr), for hypersensitivity to Potato virus Y from Solanum tuberosumMaps to Chromosome IV.

A diploid backcross population derived from a cross between Solanum tuberosum and Solanum berthaultiisegregated for monogenic dominant hypersensitivity to Potato virus Y(PVY). We propose the symbol Ny (tbr) for this locus because plants carrying this gene develop necrosis after inoculation with PVY and the allele originated in S. tuberosum. The gene mapped to chromosome IV between TG316 and TG208 at LOD=2.72. This location does not correspond to any other mapped resistance genes in potato.