Abstract
Potato virus Y (PVY) causes one of the most serious and widespread diseases in North America. In recent years, the virus has become increasingly difficult to control. Durable dominant genes for resistance to PVY exist in potato germplasm and provide an effective control strategy. This paper describes a Solanum chacoense clone (M19) that is homozygous for a PVY resistance gene. The gene is linked to a previously published marker for Rychc found in Solanum chacoense. M19 was crossed with a diploid S. tuberosum clone to produce an adapted clone carrying the resistance gene. This hybrid clone is named M20. M20 tuberizes in the field, producing round tubers with white skin and flesh and moderate size. M20 is resistant to PVYO, PVYN:O, and PVYNTN. Both M19 and M20 are female and male fertile, so they are being released as sources of PVY resistance for breeding programs.
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