Submitted to: American Journal of Potato Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: May 20, 1997
Publication Date: N/A
Interpretive Summary: Potato Virus S (PVS) is a commonly occurring latent virus of potato that has been reported to cause yield losses of 20%. When 206 potato varieties and 39 advanced breeding clones were tested for PVS only the variety Saco, which was previously described as PVS resistant, and breeding clone B6603-12 were not infected. Subsequent attempts using plant graft and mechanical inoculation techniques to infect B6603-12 with PVS have been unsuccessful. This resistance has persisted through ten tuber generations. Under greenhouse conditions, this selection from a cross between B5063-4 and B5141-6, flowers well and is cross compatible with numerous potato breeding lines. Because this clone is susceptible to potato virus X, it can serve as source of PVX without the complicating presence of PVS. This information leading to the ultimate release of B6603-12 provides plant breeders, plant geneticists, plant pathologists, and others information on the existence of PVS resistance in potato germplasm.
Technical Abstract: Potato virus S (PVS) is present in potato, Solanum tuberosum, growing areas throughout the world. Breeding line B6603-12 (Solanum tuberosum gp tuberosum) is being described as a PVS resistant potato clone. This clone has been extensively evaluated for resistance to PVS as measured by enzyme-linked immunosorbent assays (ELISA) of graft and mechanical inoculated plants. This clone is easy to protoplast, male and female fertile, a round white with good tuber conformation. Because it is susceptible to potato virus X, it can be used as a bioassay host to separate PVS from PVX.