Assessment of potato varieties preserving at VIR’s collection to (Phytophthora infestans) resistance for late blight in field and laboratory evaluation

Author:

Zoteyeva* N. M.1,Kosareva O. S.1

Affiliation:

1. All-Russian Institute of Plant Genetic Resources

Abstract

Thirty-eight varieties of potato Solanum tuberosum L. from the N. I. Vavilov All-Russian Institute of Plant Genetic Resources (VIR) collection were studied for leaf and tuber resistance to late blight. Аn aggressive Phytophthora infestans isolate collected from VIR experimental field was used for inoculation at a concentration of 50,000 zoospores/ml. The disease severity was evaluated using a scale from 1 to 9 grades, where grade 9 means resistant. Recent field observations revealed that most of the variety accessions were sensitive to late blight. In the present study, some of the varieties identified as foliar resistant in field evaluation were further tested under artificial inoculation. Resistance of some varieties found in field observations was not confirmed in laboratory assays. The data obtained in tuber inoculation tests did not show a direct correlation between resistance levels in leaves and tubers. Only some varieties possessed both characteristics, while varieties with leaf resistance and tuber sensitivity and with tuber resistance and leaf sensitivity were also identified. To develop potato varieties that combine resistance to late blight with good agronomic characteristics, resistant lines identified in this study can be potentially hybridized with varieties of high consumer value that are susceptible to late blight.

Funder

Ministry of Science and Higher Education of the Russian Federation

Publisher

All-Russian Institute of Plant Protection

Subject

General Medicine

Reference26 articles.

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