Effect of inoculum concentration and date of resistance test on expression of aggressiveness and virulence of Phytophthora infestans towards the potato
Sylwester Sobkowiak
s.sobkowiak@ihar.edu.plZakład Genetyki i Materiałów Wyjściowych Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział w Młochowie (Poland)
Hanna Zarzycka
Zakład Genetyki i Materiałów Wyjściowych Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział w Młochowie (Poland)
Renata Lebecka
Zakład Genetyki i Materiałów Wyjściowych Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział w Młochowie (Poland)
Ewa Zimnoch-Guzowska
Zakład Genetyki i Materiałów Wyjściowych Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział w Młochowie (Poland)
Abstract
The variation of aggressiveness and virulence of 12 Phytophthora infestans isolates after artificial inoculation on potato leaflets was examined in a two-year study. The expression of these features varied periodically during the year. The highest level of aggressiveness and the widest spectrum of virulence were observed in early spring and early autumn. The best stability of virulence and aggressiveness expression was presented by MP 324 and MP 423 isolates of P. infestans. Significant correlation between level of aggressiveness and detectability of virulence was noticed. Higher inoculum concentrations were found to enhance both the virulence spectrum and the level of aggressiveness of P. infestans. However, no positive effect of the increased inoculum doses on the level of aggressiveness was observed in the seasons of routine tests to assess potato resistance to P. infestans.
Keywords:
Phytophthora infestans, aggressiveness, date of evaluation, inoculum, virulenceReferences
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Authors
Sylwester Sobkowiaks.sobkowiak@ihar.edu.pl
Zakład Genetyki i Materiałów Wyjściowych Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział w Młochowie Poland
Authors
Hanna ZarzyckaZakład Genetyki i Materiałów Wyjściowych Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział w Młochowie Poland
Authors
Renata LebeckaZakład Genetyki i Materiałów Wyjściowych Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział w Młochowie Poland
Authors
Ewa Zimnoch-GuzowskaZakład Genetyki i Materiałów Wyjściowych Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział w Młochowie Poland
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