Screening Three Potato Cultivars for Resistance to Potato Virus Y Strains: Broad and Strain-Specific Sources of Resistance

• Published in: American journal of potato research 2024-04, Vol.101 (2), p.132-141
• Main Authors: Funke, Cassandra N., Tran, Lisa T., Karasev, Alexander V.
• Format: Article
• Language: English
• Subjects: Agriculture; Biomedical and Life Sciences; Cultivars; Disease resistance; Genetic diversity; Genetic variance; Genomes; Life Sciences; Plant Breeding/Biotechnology; Plant Genetics and Genomics; Plant Pathology; Plant Sciences; Plant viruses; Potatoes; Strains (organisms); Vegetables; Viruses
• ISSN: 1099-209X; 1874-9380
• DOI: 10.1007/s12230-024-09946-6

Three potato cultivars, Payette Russet, Dark Red Norland, and Chieftain were challenged with four strains of potato virus Y (PVY), PVY O , PVY Eu−N , PVY N−Wi , and PVY NTN . Cultivars Dark Red Norland and Chieftain exhibited strain-specific, hypersensitive resistance to PVY O and PVY NTN strains.. These same two cultivars, Dark Red Norland and Chieftain, appeared to have an additional resistance source in their genomes providing partial resistance against PVY N−Wi but were found fully susceptible to the non-recombinant PVY Eu−N strain. Payette Russet was found immune to the same four strains of PVY; PVY O , PVY Eu−N , PVY N−Wi , and PVY NTN , and was additionally challenged with the total of 18 isolates of PVY representing 12 genetic variants of the virus from potato and non-potato solanaceous hosts. None of the 18 isolates of the virus was found able to replicate in the inoculated or upper non-inoculated leaves of Payette Russet, confirming the broad specificity of the Ry sto gene present in the Payette Russet genome.