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VIRULENCE AND AGGRESSIVENESS OF NEW PHYTOPHTHORA INFESTANS ISOLATES COLLECTED IN NORTH-WESTERN RUSSIA AS RELATED TO HOST PLANT RESISTANCEстатья
- Авторы: SOKOLOVA E.A., KUZNETSOVA M.A., KOZLOVSKY B.E., BEKETOVA M.P., MALYUCHENKO O.P., ALEKSEEV YA I., ROGOZINA E.V., KHAVKIN E.E.
- Журнал: PPO-SPECIAL REPORT
- Номер: 17
- Год издания: 2015
- Издательство: Applied Plant Research
- Местоположение издательства: Wageningen, The Netherlands
- Первая страница: 229
- Последняя страница: 236
- Аннотация: In the recent decade, new aggressive lineages emerged in the West European populations of Phytophthora infestans which overcame many elite potato varieties known for high late blight resistance; these lineages have rapidly moved eastward displacing the previously known strains of the pathogen (Cooke et al., 2012). To evaluate the changes in P. infestans populations which spread across the North-Western Russia, we ran in 2013-2014 pilot experiments with isolates obtained from leaves collected in the field plots of the Pushkin laboratories of the N.I. Vavilov Institute of Plant Industry (VIR) in the Leningrad region of Russia. Our study has supplemented, for the first time, the phytopathological characteristics of Pushkin isolates of P. infestans with the molecular evidence. The evidence from phytopathological and molecular analyses of pure cultures of P. infestans consistently indicated the predominance of A2 mating type. We confirmed the previously observed tendency (Patrikeeva et al., 2011) for complexity of the race profile in the Pushkin population and enhanced proportion of A2 genotypes, which is consistent with the general trend recently observed in the Western and Central Europe. The isolates with A2 mating type were sensitive to metalaxyl. Indices of aggressiveness of strains obtained from leaves of potato genotypes highly resistant to late blight were significantly lower than those of strains isolated from more susceptible varieties; the indices for aggressiveness did not expressly matched the profiles of virulence genes in the isolates. When genotyped with 12 microsatellite markers, most 2013 Pushkin isolates distinctly differed from those collected in the Western Europe and in the Leningrad region in 2008. In contrast, most 2014 Pushkin isolates resembled, by many discriminants, the Western-European genotypes of P. infestans.
- Добавил в систему: Кузнецова Мария Алексеевна