Resistance to Pathogens of the Potato Accessions from the Collection of N. I. Vavilov Institute of Plant Industry (VIR)

In total, 154 accessions of wild potato species from VIR's potato collection were screened at IHAR-PIB Mochw Research Center (Poland) for resistance to Phytophthora infestans and, a part of them, for resistance to Potato Virus X (PVX) and Potato Virus Y (PVY). High levels of leaf resistance to P. infestans were found in the accessions of Central American species S. antipovichii Buk., S. cardiophyllum Lindl., S. demissum Lindl., S. guerreroense Corr., S. neoantipovichii Buk., S. papita Rydb., S. pinnatisectum Dun., S. polytrichon Rydb., S. stoloniferum Schlechtd., and S. verrucosum Schlechtd., as well as South-American species S. berthaultii Haw., S. microdontum Bitt., S. ruiz-ceballosii Card., S. simplicifolium Bitt., and S. vernei Bitt. et Wittm. Tuber resistance was found in the accessions of Central American species S. cardiophyllum, S. neoantipovichii, S. papita, S. polytrichon, S. pinnatisectum, and S. trifidum Corr., and of South-American species S. acaule Bitt., S. berthaultii Hawk., S. kurtzianum Bitt. et Wittm. and S. ruiz-ceballosii Card. The majority of the accessions were characterized by within population variation of leaf and tuber resistance to late blight under laboratory testing conditions. A few accessions of S. demissum, S. guerreroense Corr., S. neoantipovichii and S. stoloniferum expressed combined resistance to late blight, PVX and two or three strains of PVY.